20718700 has 18 divisors (see below), whose sum is σ = 44959796. Its totient is φ = 8287440.

The previous prime is 20718697. The next prime is 20718701. The reversal of 20718700 is 781702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20718701) 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 5 ways as a sum of consecutive naturals, for example, 103494 + ... + 103693.

Almost surely, 2^20718700 is an apocalyptic number.

20718700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20718700 is an abundant number, since it is smaller than the sum of its proper divisors (24241096).

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

20718700 is a wasteful number, since it uses less digits than its factorization.

20718700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207201 (or 207194 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 20718700 is about 4551.7798716546. The cubic root of 20718700 is about 274.6549943459.

The spelling of 20718700 in words is "twenty million, seven hundred eighteen thousand, seven hundred".