20700660 has 24 divisors (see below), whose sum is σ = 57962016. Its totient is φ = 5520160.

The previous prime is 20700643. The next prime is 20700677. The reversal of 20700660 is 6600702.

It is an interprime number because it is at equal distance from previous prime (20700643) and next prime (20700677).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172446 + ... + 172565.

It is an arithmetic number, because the mean of its divisors is an integer number (2415084).

Almost surely, 2^20700660 is an apocalyptic number.

20700660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20700660 is an abundant number, since it is smaller than the sum of its proper divisors (37261356).

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

20700660 is a wasteful number, since it uses less digits than its factorization.

20700660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345023 (or 345021 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20700660 is about 4549.7977977049. The cubic root of 20700660 is about 274.5752561568.

The spelling of 20700660 in words is "twenty million, seven hundred thousand, six hundred sixty".