Search a number
-
+
31323420 = 22325174019
BaseRepresentation
bin111011101111…
…1010100011100
32011221101122200
41313133110130
531004322140
63035211500
7530146632
oct167372434
964841580
1031323420
1116754827
12a5a6b90
13664948b
144235352
152b3b030
hex1ddf51c

31323420 has 36 divisors (see below), whose sum is σ = 95014920. Its totient is φ = 8352864.

The previous prime is 31323403. The next prime is 31323431. The reversal of 31323420 is 2432313.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 31323393 and 31323402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86830 + ... + 87189.

Almost surely, 231323420 is an apocalyptic number.

31323420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31323420 is an abundant number, since it is smaller than the sum of its proper divisors (63691500).

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

31323420 is a wasteful number, since it uses less digits than its factorization.

31323420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174034 (or 174029 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 31323420 is about 5596.7329755850. The cubic root of 31323420 is about 315.2267452848.

Adding to 31323420 its reverse (2432313), we get a palindrome (33755733).

The spelling of 31323420 in words is "thirty-one million, three hundred twenty-three thousand, four hundred twenty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 90 180 174019 348038 522057 696076 870095 1044114 1566171 1740190 2088228 2610285 3132342 3480380 5220570 6264684 7830855 10441140 15661710 31323420