20892913 has 4 divisors (see below), whose sum is σ = 21992560. Its totient is φ = 19793268.

The previous prime is 20892899. The next prime is 20892931. The reversal of 20892913 is 31929802.

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: 31929802 = 2 ⋅15964901.

It is a cyclic number.

It is not a de Polignac number, because 20892913 - 2¹⁷ = 20761841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20892953) 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, 549795 + ... + 549832.

It is an arithmetic number, because the mean of its divisors is an integer number (5498140).

Almost surely, 2^20892913 is an apocalyptic number.

It is an amenable number.

20892913 is a deficient number, since it is larger than the sum of its proper divisors (1099647).

20892913 is a wasteful number, since it uses less digits than its factorization.

20892913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099646.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20892913 is about 4570.8766117672. The cubic root of 20892913 is about 275.4226580568.

The spelling of 20892913 in words is "twenty million, eight hundred ninety-two thousand, nine hundred thirteen".