20972644 has 48 divisors (see below), whose sum is σ = 46166400. Its totient is φ = 8098560.

The previous prime is 20972641. The next prime is 20972659. The reversal of 20972644 is 44627902.

It is not an unprimeable number, because it can be changed into a prime (20972641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45664 + ... + 46120.

It is an arithmetic number, because the mean of its divisors is an integer number (961800).

Almost surely, 2^20972644 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 20972644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23083200).

20972644 is an abundant number, since it is smaller than the sum of its proper divisors (25193756).

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

20972644 is a wasteful number, since it uses less digits than its factorization.

20972644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 20972644 is about 4579.5899379748. The cubic root of 20972644 is about 275.7725669625.

The spelling of 20972644 in words is "twenty million, nine hundred seventy-two thousand, six hundred forty-four".