20939776 has 99 divisors (see below), whose sum is σ = 49821933. Its totient is φ = 8785920.

The previous prime is 20939771. The next prime is 20939783. The reversal of 20939776 is 67793902.

The square root of 20939776 is 4576.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3097600 + 17842176 = 1760^2 + 4224^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20939771) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1610746 + ... + 1610758.

Almost surely, 2^20939776 is an apocalyptic number.

20939776 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20939776 is the 4576-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20939776

20939776 is an abundant number, since it is smaller than the sum of its proper divisors (28882157).

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

20939776 is a wasteful number, since it uses less digits than its factorization.

20939776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 43.

The cubic root of 20939776 is about 275.6284294869.

Multiplying 20939776 by its product of nonzero digits (142884), we get a square (2991958953984 = 1729728²).

The spelling of 20939776 in words is "twenty million, nine hundred thirty-nine thousand, seven hundred seventy-six".