20187021960 has 768 divisors, whose sum is σ = 87316704000. Its totient is φ = 4110704640.

The previous prime is 20187021947. The next prime is 20187021997. The reversal of 20187021960 is 6912078102.

It is a super-2 number, since 2×20187021960² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 17092570 + ... + 17093750.

It is an arithmetic number, because the mean of its divisors is an integer number (113693625).

Almost surely, 2^20187021960 is an apocalyptic number.

20187021960 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 20187021960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43658352000).

20187021960 is an abundant number, since it is smaller than the sum of its proper divisors (67129682040).

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

20187021960 is a wasteful number, since it uses less digits than its factorization.

20187021960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 20187021960 in words is "twenty billion, one hundred eighty-seven million, twenty-one thousand, nine hundred sixty".