20018073900 has 72 divisors (see below), whose sum is σ = 63184330944. Its totient is φ = 4852865600.

The previous prime is 20018073853. The next prime is 20018073917. The reversal of 20018073900 is 937081002.

It is a happy number.

It is a super-2 number, since 2×20018073900² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 3029742 + ... + 3036341.

It is an arithmetic number, because the mean of its divisors is an integer number (877560152).

Almost surely, 2^20018073900 is an apocalyptic number.

20018073900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20018073900 is an abundant number, since it is smaller than the sum of its proper divisors (43166257044).

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

20018073900 is a wasteful number, since it uses less digits than its factorization.

20018073900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066111 (or 6066104 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 20018073900 in words is "twenty billion, eighteen million, seventy-three thousand, nine hundred".