20868507 has 18 divisors (see below), whose sum is σ = 33134556. Its totient is φ = 12646920.

The previous prime is 20868499. The next prime is 20868509. The reversal of 20868507 is 70586802.

It is not a de Polignac number, because 20868507 - 2³ = 20868499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20868509) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8493 + ... + 10670.

Almost surely, 2^20868507 is an apocalyptic number.

20868507 is a deficient number, since it is larger than the sum of its proper divisors (12266049).

20868507 is a wasteful number, since it uses less digits than its factorization.

20868507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19191 (or 19177 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 20868507 is about 4568.2061030562. The cubic root of 20868507 is about 275.3153715253.

The spelling of 20868507 in words is "twenty million, eight hundred sixty-eight thousand, five hundred seven".