20613900 has 36 divisors (see below), whose sum is σ = 59643752. Its totient is φ = 5496960.

The previous prime is 20613881. The next prime is 20613907. The reversal of 20613900 is 931602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34057 + ... + 34656.

Almost surely, 2^20613900 is an apocalyptic number.

20613900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20613900 is an abundant number, since it is smaller than the sum of its proper divisors (39029852).

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

20613900 is a wasteful number, since it uses less digits than its factorization.

20613900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68730 (or 68723 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20613900 is about 4540.2532968988. The cubic root of 20613900 is about 274.1911217406.

The spelling of 20613900 in words is "twenty million, six hundred thirteen thousand, nine hundred".