20290956 has 24 divisors (see below), whose sum is σ = 54109440. Its totient is φ = 5797392.

The previous prime is 20290951. The next prime is 20290961. The reversal of 20290956 is 65909202.

It is an interprime number because it is at equal distance from previous prime (20290951) and next prime (20290961).

It is not an unprimeable number, because it can be changed into a prime (20290951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120696 + ... + 120863.

It is an arithmetic number, because the mean of its divisors is an integer number (2254560).

Almost surely, 2^20290956 is an apocalyptic number.

It is an amenable number.

20290956 is an abundant number, since it is smaller than the sum of its proper divisors (33818484).

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

20290956 is a wasteful number, since it uses less digits than its factorization.

20290956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241573 (or 241571 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20290956 is about 4504.5483680387. The cubic root of 20290956 is about 272.7517231816.

The spelling of 20290956 in words is "twenty million, two hundred ninety thousand, nine hundred fifty-six".