20707577 has 12 divisors (see below), whose sum is σ = 23197860. Its totient is φ = 18464160.

The previous prime is 20707543. The next prime is 20707579. The reversal of 20707577 is 77570702.

It can be written as a sum of positive squares in 2 ways, for example, as 10601536 + 10106041 = 3256^2 + 3179^2 .

It is not a de Polignac number, because 20707577 - 2¹² = 20703481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20707579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4799 + ... + 8027.

It is an arithmetic number, because the mean of its divisors is an integer number (1933155).

Almost surely, 2^20707577 is an apocalyptic number.

It is an amenable number.

20707577 is a deficient number, since it is larger than the sum of its proper divisors (2490283).

20707577 is a wasteful number, since it uses less digits than its factorization.

20707577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304 (or 3293 counting only the distinct ones).

The product of its (nonzero) digits is 24010, while the sum is 35.

The square root of 20707577 is about 4550.5578778871. The cubic root of 20707577 is about 274.6058353034.

The spelling of 20707577 in words is "twenty million, seven hundred seven thousand, five hundred seventy-seven".