20664422540 has 24 divisors (see below), whose sum is σ = 43440204192. Its totient is φ = 8257213440.

The previous prime is 20664422533. The next prime is 20664422549. The reversal of 20664422540 is 4522446602.

It is a self number, because there is not a number n which added to its sum of digits gives 20664422540.

It is not an unprimeable number, because it can be changed into a prime (20664422549) 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, 514901 + ... + 553580.

It is an arithmetic number, because the mean of its divisors is an integer number (1810008508).

Almost surely, 2^20664422540 is an apocalyptic number.

20664422540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20664422540 is an abundant number, since it is smaller than the sum of its proper divisors (22775781652).

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

20664422540 is a wasteful number, since it uses less digits than its factorization.

20664422540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069457 (or 1069455 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

The spelling of 20664422540 in words is "twenty billion, six hundred sixty-four million, four hundred twenty-two thousand, five hundred forty".