20637072 has 160 divisors (see below), whose sum is σ = 64757760. Its totient is φ = 6272640.

The previous prime is 20637047. The next prime is 20637101. The reversal of 20637072 is 27073602.

20637072 is a `hidden beast` number, since 20 + 637 + 0 + 7 + 2 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307983 + ... + 308049.

It is an arithmetic number, because the mean of its divisors is an integer number (404736).

Almost surely, 2^20637072 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 20637072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32378880).

20637072 is an abundant number, since it is smaller than the sum of its proper divisors (44120688).

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

20637072 is a wasteful number, since it uses less digits than its factorization.

20637072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20637072 is about 4542.8044201792. The cubic root of 20637072 is about 274.2938223050.

The spelling of 20637072 in words is "twenty million, six hundred thirty-seven thousand, seventy-two".