20988072 has 120 divisors (see below), whose sum is σ = 68487210. Its totient is φ = 5987520.

The previous prime is 20988061. The next prime is 20988089. The reversal of 20988072 is 27088902.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 5731236 = 3906^2 + 2394^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 31422 + ... + 32082.

Almost surely, 2^20988072 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 20988072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34243605).

20988072 is an abundant number, since it is smaller than the sum of its proper divisors (47499138).

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

20988072 is a wasteful number, since it uses less digits than its factorization.

20988072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20988072 is about 4581.2740585999. The cubic root of 20988072 is about 275.8401721140.

The spelling of 20988072 in words is "twenty million, nine hundred eighty-eight thousand, seventy-two".