20464660 has 24 divisors (see below), whose sum is σ = 43462440. Its totient is φ = 8093184.

The previous prime is 20464657. The next prime is 20464669. The reversal of 20464660 is 6646402.

It can be written as a sum of positive squares in 4 ways, for example, as 857476 + 19607184 = 926^2 + 4428^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20464669) 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, 3969 + ... + 7528.

It is an arithmetic number, because the mean of its divisors is an integer number (1810935).

Almost surely, 2^20464660 is an apocalyptic number.

20464660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20464660 is an abundant number, since it is smaller than the sum of its proper divisors (22997780).

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

20464660 is a wasteful number, since it uses less digits than its factorization.

20464660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11595 (or 11593 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20464660 is about 4523.7882355389. The cubic root of 20464660 is about 273.5278244293.

The spelling of 20464660 in words is "twenty million, four hundred sixty-four thousand, six hundred sixty".