20736404 has 24 divisors (see below), whose sum is σ = 39437160. Its totient is φ = 9483264.

The previous prime is 20736367. The next prime is 20736407. The reversal of 20736404 is 40463702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2656900 + 18079504 = 1630^2 + 4252^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4112 + ... + 7640.

It is an arithmetic number, because the mean of its divisors is an integer number (1643215).

Almost surely, 2^20736404 is an apocalyptic number.

It is an amenable number.

20736404 is a deficient number, since it is larger than the sum of its proper divisors (18700756).

20736404 is a wasteful number, since it uses less digits than its factorization.

20736404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659 (or 3657 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20736404 is about 4553.7241901547. The cubic root of 20736404 is about 274.7332024009.

The spelling of 20736404 in words is "twenty million, seven hundred thirty-six thousand, four hundred four".