20964869 has 4 divisors (see below), whose sum is σ = 21003744. Its totient is φ = 20925996.

The previous prime is 20964857. The next prime is 20964871. The reversal of 20964869 is 96846902.

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: 96846902 = 2 ⋅48423451.

It is a cyclic number.

It is not a de Polignac number, because 20964869 - 2⁸ = 20964613 is a prime.

It is a super-2 number, since 2×20964869² = 879051464374322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964169) 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, 18617 + ... + 19710.

It is an arithmetic number, because the mean of its divisors is an integer number (5250936).

Almost surely, 2^20964869 is an apocalyptic number.

It is an amenable number.

20964869 is a deficient number, since it is larger than the sum of its proper divisors (38875).

20964869 is an equidigital number, since it uses as much as digits as its factorization.

20964869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38874.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 20964869 is about 4578.7409841571. The cubic root of 20964869 is about 275.7384845213.

The spelling of 20964869 in words is "twenty million, nine hundred sixty-four thousand, eight hundred sixty-nine".