20939072 has 84 divisors (see below), whose sum is σ = 52815744. Its totient is φ = 8144640.

The previous prime is 20939071. The next prime is 20939123. The reversal of 20939072 is 27093902.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34193 + ... + 34799.

Almost surely, 2^20939072 is an apocalyptic number.

20939072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20939072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26407872).

20939072 is an abundant number, since it is smaller than the sum of its proper divisors (31876672).

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

20939072 is a wasteful number, since it uses less digits than its factorization.

20939072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 20939072 is about 4575.9230762765. The cubic root of 20939072 is about 275.6253405556.

It can be divided in two parts, 2093907 and 2, that multiplied together give a palindrome (4187814).

The spelling of 20939072 in words is "twenty million, nine hundred thirty-nine thousand, seventy-two".