20772580 has 12 divisors (see below), whose sum is σ = 43622460. Its totient is φ = 8309024.

The previous prime is 20772559. The next prime is 20772581. The reversal of 20772580 is 8527702.

It can be written as a sum of positive squares in 2 ways, for example, as 11075584 + 9696996 = 3328^2 + 3114^2 .

It is not an unprimeable number, because it can be changed into a prime (20772581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519295 + ... + 519334.

It is an arithmetic number, because the mean of its divisors is an integer number (3635205).

Almost surely, 2^20772580 is an apocalyptic number.

20772580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20772580 is an abundant number, since it is smaller than the sum of its proper divisors (22849880).

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

20772580 is a wasteful number, since it uses less digits than its factorization.

20772580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038638 (or 1038636 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 20772580 is about 4557.6945926641. The cubic root of 20772580 is about 274.8928728743.

The spelling of 20772580 in words is "twenty million, seven hundred seventy-two thousand, five hundred eighty".