20420956 has 12 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 10156640.

The previous prime is 20420951. The next prime is 20420957. The reversal of 20420956 is 65902402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12601 + ... + 14128.

It is an arithmetic number, because the mean of its divisors is an integer number (2993760).

Almost surely, 2^20420956 is an apocalyptic number.

It is an amenable number.

20420956 is a deficient number, since it is larger than the sum of its proper divisors (15504164).

20420956 is a wasteful number, since it uses less digits than its factorization.

20420956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26924 (or 26922 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20420956 is about 4518.9551889790. The cubic root of 20420956 is about 273.3329717756.

The spelling of 20420956 in words is "twenty million, four hundred twenty thousand, nine hundred fifty-six".