20974872 has 64 divisors (see below), whose sum is σ = 56181600. Its totient is φ = 6502400.

The previous prime is 20974867. The next prime is 20974883. The reversal of 20974872 is 27847902.

It is a self number, because there is not a number n which added to its sum of digits gives 20974872.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40954 + ... + 41462.

Almost surely, 2^20974872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20974872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28090800).

20974872 is an abundant number, since it is smaller than the sum of its proper divisors (35206728).

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

20974872 is a wasteful number, since it uses less digits than its factorization.

20974872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 20974872 is about 4579.8331847350. The cubic root of 20974872 is about 275.7823320566.

The spelling of 20974872 in words is "twenty million, nine hundred seventy-four thousand, eight hundred seventy-two".