20974436 has 24 divisors (see below), whose sum is σ = 43774080. Its totient is φ = 8597952.

The previous prime is 20974409. The next prime is 20974439. The reversal of 20974436 is 63447902.

It is a junction number, because it is equal to n+sod(n) for n = 20974396 and 20974405.

It is not an unprimeable number, because it can be changed into a prime (20974439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15641 + ... + 16928.

It is an arithmetic number, because the mean of its divisors is an integer number (1823920).

Almost surely, 2^20974436 is an apocalyptic number.

It is an amenable number.

20974436 is an abundant number, since it is smaller than the sum of its proper divisors (22799644).

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

20974436 is a wasteful number, since it uses less digits than its factorization.

20974436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32603 (or 32601 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20974436 is about 4579.7855845007. The cubic root of 20974436 is about 275.7804211680.

The spelling of 20974436 in words is "twenty million, nine hundred seventy-four thousand, four hundred thirty-six".