20988702720 has 208 divisors, whose sum is σ = 74619354720. Its totient is φ = 5596839936.

The previous prime is 20988702719. The next prime is 20988702767. The reversal of 20988702720 is 2720788902.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 533982 + ... + 571938.

Almost surely, 2^20988702720 is an apocalyptic number.

20988702720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20988702720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37309677360).

20988702720 is an abundant number, since it is smaller than the sum of its proper divisors (53630652000).

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

20988702720 is an equidigital number, since it uses as much as digits as its factorization.

20988702720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37995 (or 37967 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 20988702720 in words is "twenty billion, nine hundred eighty-eight million, seven hundred two thousand, seven hundred twenty".