20731077 has 12 divisors (see below), whose sum is σ = 30367584. Its totient is φ = 13625640.

The previous prime is 20731069. The next prime is 20731091. The reversal of 20731077 is 77013702.

It is not a de Polignac number, because 20731077 - 2³ = 20731069 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20731077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15583 + ... + 16860.

It is an arithmetic number, because the mean of its divisors is an integer number (2530632).

Almost surely, 2^20731077 is an apocalyptic number.

It is an amenable number.

20731077 is a deficient number, since it is larger than the sum of its proper divisors (9636507).

20731077 is a wasteful number, since it uses less digits than its factorization.

20731077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32520 (or 32517 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 20731077 is about 4553.1392467176. The cubic root of 20731077 is about 274.7096748708.

Adding to 20731077 its reverse (77013702), we get a palindrome (97744779).

The spelling of 20731077 in words is "twenty million, seven hundred thirty-one thousand, seventy-seven".