20577913 has 4 divisors (see below), whose sum is σ = 20591440. Its totient is φ = 20564388.

The previous prime is 20577901. The next prime is 20577959. The reversal of 20577913 is 31977502.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31977502 = 2 ⋅15988751.

It is a cyclic number.

It is not a de Polignac number, because 20577913 - 2⁵ = 20577881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20577013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4143 + ... + 7636.

It is an arithmetic number, because the mean of its divisors is an integer number (5147860).

Almost surely, 2^20577913 is an apocalyptic number.

It is an amenable number.

20577913 is a deficient number, since it is larger than the sum of its proper divisors (13527).

20577913 is a wasteful number, since it uses less digits than its factorization.

20577913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13526.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 20577913 is about 4536.2884608455. The cubic root of 20577913 is about 274.0314711574.

The spelling of 20577913 in words is "twenty million, five hundred seventy-seven thousand, nine hundred thirteen".