20188423980 has 72 divisors (see below), whose sum is σ = 62393686992. Its totient is φ = 5282000256.

The previous prime is 20188423961. The next prime is 20188423999. The reversal of 20188423980 is 8932488102.

It is an interprime number because it is at equal distance from previous prime (20188423961) and next prime (20188423999).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1048554 + ... + 1067633.

It is an arithmetic number, because the mean of its divisors is an integer number (866578986).

Almost surely, 2^20188423980 is an apocalyptic number.

20188423980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20188423980 is an abundant number, since it is smaller than the sum of its proper divisors (42205263012).

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

20188423980 is a wasteful number, since it uses less digits than its factorization.

20188423980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116255 (or 2116250 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 20188423980 in words is "twenty billion, one hundred eighty-eight million, four hundred twenty-three thousand, nine hundred eighty".