20702913 has 64 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 9884160.

The previous prime is 20702911. The next prime is 20702971. The reversal of 20702913 is 31920702.

It is not a de Polignac number, because 20702913 - 2¹ = 20702911 is a prime.

It is a super-2 number, since 2×20702913² = 857221213371138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20702911) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 232573 + ... + 232661.

It is an arithmetic number, because the mean of its divisors is an integer number (583200).

Almost surely, 2^20702913 is an apocalyptic number.

It is an amenable number.

20702913 is a deficient number, since it is larger than the sum of its proper divisors (16621887).

20702913 is a wasteful number, since it uses less digits than its factorization.

20702913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20702913 is about 4550.0453843890. The cubic root of 20702913 is about 274.5852171212.

The spelling of 20702913 in words is "twenty million, seven hundred two thousand, nine hundred thirteen".