20910613 has 4 divisors (see below), whose sum is σ = 21070368. Its totient is φ = 20750860.

The previous prime is 20910607. The next prime is 20910641. The reversal of 20910613 is 31601902.

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 20910613 - 2⁹ = 20910101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20910413) 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, 79681 + ... + 79942.

It is an arithmetic number, because the mean of its divisors is an integer number (5267592).

Almost surely, 2^20910613 is an apocalyptic number.

It is an amenable number.

20910613 is a deficient number, since it is larger than the sum of its proper divisors (159755).

20910613 is a wasteful number, since it uses less digits than its factorization.

20910613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159754.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20910613 is about 4572.8123731463. The cubic root of 20910613 is about 275.5004133709.

The spelling of 20910613 in words is "twenty million, nine hundred ten thousand, six hundred thirteen".