20315256 has 128 divisors (see below), whose sum is σ = 60480000. Its totient is φ = 5626368.

The previous prime is 20315227. The next prime is 20315263. The reversal of 20315256 is 65251302.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136270 + ... + 136418.

It is an arithmetic number, because the mean of its divisors is an integer number (472500).

Almost surely, 2^20315256 is an apocalyptic number.

20315256 is a gapful number since it is divisible by the number (26) 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 20315256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30240000).

20315256 is an abundant number, since it is smaller than the sum of its proper divisors (40164744).

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

20315256 is a wasteful number, since it uses less digits than its factorization.

20315256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20315256 is about 4507.2448347078. The cubic root of 20315256 is about 272.8605602228.

Adding to 20315256 its reverse (65251302), we get a palindrome (85566558).

The spelling of 20315256 in words is "twenty million, three hundred fifteen thousand, two hundred fifty-six".