20653913 has 4 divisors (see below), whose sum is σ = 23604480. Its totient is φ = 17703348.

The previous prime is 20653909. The next prime is 20653921. The reversal of 20653913 is 31935602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20653913 - 2² = 20653909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20653903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1475273 + ... + 1475286.

It is an arithmetic number, because the mean of its divisors is an integer number (5901120).

Almost surely, 2^20653913 is an apocalyptic number.

It is an amenable number.

20653913 is a deficient number, since it is larger than the sum of its proper divisors (2950567).

20653913 is an equidigital number, since it uses as much as digits as its factorization.

20653913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950566.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20653913 is about 4544.6576328696. The cubic root of 20653913 is about 274.3684150294.

The spelling of 20653913 in words is "twenty million, six hundred fifty-three thousand, nine hundred thirteen".