20772810 has 48 divisors (see below), whose sum is σ = 57190536. Its totient is φ = 5213184.

The previous prime is 20772809. The next prime is 20772811. The reversal of 20772810 is 1827702.

It is an interprime number because it is at equal distance from previous prime (20772809) and next prime (20772811).

It can be written as a sum of positive squares in 4 ways, for example, as 20766249 + 6561 = 4557^2 + 81^2 .

It is a super-2 number, since 2×20772810² = 863019270592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20772811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5259 + ... + 8318.

Almost surely, 2^20772810 is an apocalyptic number.

20772810 is an abundant number, since it is smaller than the sum of its proper divisors (36417726).

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

20772810 is a wasteful number, since it uses less digits than its factorization.

20772810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13607 (or 13604 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20772810 is about 4557.7198246492. The cubic root of 20772810 is about 274.8938874349.

The spelling of 20772810 in words is "twenty million, seven hundred seventy-two thousand, eight hundred ten".