20507680 has 24 divisors (see below), whose sum is σ = 48449772. Its totient is φ = 8203008.

The previous prime is 20507653. The next prime is 20507693. The reversal of 20507680 is 8670502.

It can be written as a sum of positive squares in 2 ways, for example, as 18558864 + 1948816 = 4308^2 + 1396^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63927 + ... + 64246.

Almost surely, 2^20507680 is an apocalyptic number.

20507680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20507680 is an abundant number, since it is smaller than the sum of its proper divisors (27942092).

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

20507680 is a wasteful number, since it uses less digits than its factorization.

20507680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128188 (or 128180 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20507680 is about 4528.5406037707. The cubic root of 20507680 is about 273.7193567445.

It can be divided in two parts, 2050 and 7680, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 20507680 in words is "twenty million, five hundred seven thousand, six hundred eighty".