20712972 has 96 divisors (see below), whose sum is σ = 58834944. Its totient is φ = 5544000.

The previous prime is 20712917. The next prime is 20712973. The reversal of 20712972 is 27921702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20712973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137097 + ... + 137247.

It is an arithmetic number, because the mean of its divisors is an integer number (612864).

Almost surely, 2^20712972 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 20712972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29417472).

20712972 is an abundant number, since it is smaller than the sum of its proper divisors (38121972).

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

20712972 is a wasteful number, since it uses less digits than its factorization.

20712972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20712972 is about 4551.1506237434. The cubic root of 20712972 is about 274.6296811617.

The spelling of 20712972 in words is "twenty million, seven hundred twelve thousand, nine hundred seventy-two".