20396680 has 32 divisors (see below), whose sum is σ = 47015640. Its totient is φ = 7959040.

The previous prime is 20396591. The next prime is 20396681. The reversal of 20396680 is 8669302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5171076 + 15225604 = 2274^2 + 3902^2 .

It is not an unprimeable number, because it can be changed into a prime (20396681) 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, 4579 + ... + 7858.

Almost surely, 2^20396680 is an apocalyptic number.

20396680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20396680 is an abundant number, since it is smaller than the sum of its proper divisors (26618960).

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

20396680 is a wasteful number, since it uses less digits than its factorization.

20396680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12489 (or 12485 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20396680 is about 4516.2683711223. The cubic root of 20396680 is about 273.2246180120.

The spelling of 20396680 in words is "twenty million, three hundred ninety-six thousand, six hundred eighty".