20664402480 has 100 divisors (see below), whose sum is σ = 71770553712. Its totient is φ = 5510505600.

The previous prime is 20664402467. The next prime is 20664402481. The reversal of 20664402480 is 8420446602.

It is a happy number.

20664402480 is a `hidden beast` number, since 2 + 0 + 6 + 644 + 0 + 2 + 4 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20664402481) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1587996 + ... + 1600955.

Almost surely, 2^20664402480 is an apocalyptic number.

20664402480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20664402480 is an abundant number, since it is smaller than the sum of its proper divisors (51106151232).

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

20664402480 is a wasteful number, since it uses less digits than its factorization.

20664402480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188976 (or 3188961 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

The spelling of 20664402480 in words is "twenty billion, six hundred sixty-four million, four hundred two thousand, four hundred eighty".