18220402480 has 40 divisors (see below), whose sum is σ = 48414213792. Its totient is φ = 6246994944.

The previous prime is 18220402441. The next prime is 18220402481. The reversal of 18220402480 is 8420402281.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (18220402481) 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, 16267657 + ... + 16268776.

Almost surely, 2^18220402480 is an apocalyptic number.

18220402480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18220402480 is an abundant number, since it is smaller than the sum of its proper divisors (30193811312).

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

18220402480 is a wasteful number, since it uses less digits than its factorization.

18220402480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32536453 (or 32536447 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The spelling of 18220402480 in words is "eighteen billion, two hundred twenty million, four hundred two thousand, four hundred eighty".