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70720020 = 22335753353
BaseRepresentation
bin1000011011100…
…01101000010100
311221001221122000
410031301220110
5121101020040
611003435300
71516052550
oct415615024
9157057560
1070720020
1136a12aa8
121b825b30
1311861487
14956c860
15631e130
hex4371a14

70720020 has 192 divisors, whose sum is σ = 256919040. Its totient is φ = 15814656.

The previous prime is 70719977. The next prime is 70720031. The reversal of 70720020 is 2002707.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 70719975 and 70720002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 200164 + ... + 200516.

It is an arithmetic number, because the mean of its divisors is an integer number (1338120).

Almost surely, 270720020 is an apocalyptic number.

70720020 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70720020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128459520).

70720020 is an abundant number, since it is smaller than the sum of its proper divisors (186199020).

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

70720020 is a wasteful number, since it uses less digits than its factorization.

70720020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 18.

The square root of 70720020 is about 8409.5196057801. The cubic root of 70720020 is about 413.5367639493.

Adding to 70720020 its reverse (2002707), we get a palindrome (72722727).

The spelling of 70720020 in words is "seventy million, seven hundred twenty thousand, twenty".