20256388 has 12 divisors (see below), whose sum is σ = 36117900. Its totient is φ = 9936992.

The previous prime is 20256377. The next prime is 20256391. The reversal of 20256388 is 88365202.

It can be written as a sum of positive squares in 2 ways, for example, as 13191424 + 7064964 = 3632^2 + 2658^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47563 + ... + 47986.

It is an arithmetic number, because the mean of its divisors is an integer number (3009825).

Almost surely, 2^20256388 is an apocalyptic number.

It is an amenable number.

20256388 is a deficient number, since it is larger than the sum of its proper divisors (15861512).

20256388 is a wasteful number, since it uses less digits than its factorization.

20256388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95606 (or 95604 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20256388 is about 4500.7097218106. The cubic root of 20256388 is about 272.5967470630.

The spelling of 20256388 in words is "twenty million, two hundred fifty-six thousand, three hundred eighty-eight".