20972562 has 64 divisors (see below), whose sum is σ = 47752320. Its totient is φ = 6132672.

The previous prime is 20972537. The next prime is 20972579. The reversal of 20972562 is 26527902.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487713 + ... + 487755.

It is an arithmetic number, because the mean of its divisors is an integer number (746130).

Almost surely, 2^20972562 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20972562, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23876160).

20972562 is an abundant number, since it is smaller than the sum of its proper divisors (26779758).

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

20972562 is a wasteful number, since it uses less digits than its factorization.

20972562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20972562 is about 4579.5809851994. The cubic root of 20972562 is about 275.7722075518.

It can be divided in two parts, 209 and 72562, that added together give a triangular number (72771 = T₃₈₁).

The spelling of 20972562 in words is "twenty million, nine hundred seventy-two thousand, five hundred sixty-two".