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130023220 = 2257389057
BaseRepresentation
bin1111011111111…
…11111100110100
3100001122212022211
413233333330310
5231241220340
620522503204
73136115305
oct757777464
9301585284
10130023220
1167438408
1237664b04
1320c26222
14133a87ac
15b6355ea
hex7bfff34

130023220 has 24 divisors (see below), whose sum is σ = 276792264. Its totient is φ = 51296256.

The previous prime is 130023203. The next prime is 130023221. The reversal of 130023220 is 22320031.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1790244 + 128232976 = 1338^2 + 11324^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 130023220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130023221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43069 + ... + 45988.

It is an arithmetic number, because the mean of its divisors is an integer number (11533011).

Almost surely, 2130023220 is an apocalyptic number.

130023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130023220 is an abundant number, since it is smaller than the sum of its proper divisors (146769044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

130023220 is a wasteful number, since it uses less digits than its factorization.

130023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89139 (or 89137 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 130023220 is about 11402.7724698864. The cubic root of 130023220 is about 506.6098610906.

Adding to 130023220 its reverse (22320031), we get a palindrome (152343251).

The spelling of 130023220 in words is "one hundred thirty million, twenty-three thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 73 146 292 365 730 1460 89057 178114 356228 445285 890570 1781140 6501161 13002322 26004644 32505805 65011610 130023220