12636820 has 24 divisors (see below), whose sum is σ = 30328704. Its totient is φ = 4332576.

The previous prime is 12636791. The next prime is 12636823. The reversal of 12636820 is 2863621.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12636823) 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, 44992 + ... + 45271.

It is an arithmetic number, because the mean of its divisors is an integer number (1263696).

Almost surely, 2^12636820 is an apocalyptic number.

12636820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12636820 is an abundant number, since it is smaller than the sum of its proper divisors (17691884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12636820 is a wasteful number, since it uses less digits than its factorization.

12636820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90279 (or 90277 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 12636820 is about 3554.8305163538. The cubic root of 12636820 is about 232.9231205158.

It can be divided in two parts, 12636 and 820, that added together give a square (13456 = 116²).

The spelling of 12636820 in words is "twelve million, six hundred thirty-six thousand, eight hundred twenty".