20736969 has 32 divisors (see below), whose sum is σ = 31256064. Its totient is φ = 12122880.

The previous prime is 20736967. The next prime is 20736973. The reversal of 20736969 is 96963702.

It is not a de Polignac number, because 20736969 - 2¹ = 20736967 is a prime.

It is a super-2 number, since 2×20736969² = 860043766613922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20736969.

It is not an unprimeable number, because it can be changed into a prime (20736967) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183457 + ... + 183569.

It is an arithmetic number, because the mean of its divisors is an integer number (976752).

Almost surely, 2^20736969 is an apocalyptic number.

It is an amenable number.

20736969 is a deficient number, since it is larger than the sum of its proper divisors (10519095).

20736969 is a wasteful number, since it uses less digits than its factorization.

20736969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 20736969 is about 4553.7862268666. The cubic root of 20736969 is about 274.7356975755.

The spelling of 20736969 in words is "twenty million, seven hundred thirty-six thousand, nine hundred sixty-nine".