20770685 has 16 divisors (see below), whose sum is σ = 28422576. Its totient is φ = 14435328.

The previous prime is 20770681. The next prime is 20770697. The reversal of 20770685 is 58607702.

It can be written as a sum of positive squares in 8 ways, for example, as 77284 + 20693401 = 278^2 + 4549^2 .

It is a cyclic number.

It is not a de Polignac number, because 20770685 - 2² = 20770681 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20770681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8294 + ... + 10503.

It is an arithmetic number, because the mean of its divisors is an integer number (1776411).

Almost surely, 2^20770685 is an apocalyptic number.

It is an amenable number.

20770685 is a deficient number, since it is larger than the sum of its proper divisors (7651891).

20770685 is a wasteful number, since it uses less digits than its factorization.

20770685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18832.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 20770685 is about 4557.4866977315. The cubic root of 20770685 is about 274.8845134916.

The spelling of 20770685 in words is "twenty million, seven hundred seventy thousand, six hundred eighty-five".