20256402 has 8 divisors (see below), whose sum is σ = 40512816. Its totient is φ = 6752132.

The previous prime is 20256391. The next prime is 20256403. The reversal of 20256402 is 20465202.

It is a sphenic number, since it is the product of 3 distinct primes.

20256402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20256403) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1688028 + ... + 1688039.

It is an arithmetic number, because the mean of its divisors is an integer number (5064102).

Almost surely, 2^20256402 is an apocalyptic number.

20256402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20256402 is a wasteful number, since it uses less digits than its factorization.

20256402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376072.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20256402 is about 4500.7112771205. The cubic root of 20256402 is about 272.5968098639.

The spelling of 20256402 in words is "twenty million, two hundred fifty-six thousand, four hundred two".