20924972 has 12 divisors (see below), whose sum is σ = 36756720. Its totient is φ = 10423056.

The previous prime is 20924957. The next prime is 20924987. The reversal of 20924972 is 27942902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20924957) and next prime (20924987).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8648 + ... + 10799.

It is an arithmetic number, because the mean of its divisors is an integer number (3063060).

Almost surely, 2^20924972 is an apocalyptic number.

It is an amenable number.

20924972 is a deficient number, since it is larger than the sum of its proper divisors (15831748).

20924972 is a wasteful number, since it uses less digits than its factorization.

20924972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19720 (or 19718 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20924972 is about 4574.3821440715. The cubic root of 20924972 is about 275.5634595904.

The spelling of 20924972 in words is "twenty million, nine hundred twenty-four thousand, nine hundred seventy-two".