220941985940 has 24 divisors (see below), whose sum is σ = 499668799560. Its totient is φ = 81578579328.

The previous prime is 220941985939. The next prime is 220941985961. The reversal of 220941985940 is 49589149022.

It can be written as a sum of positive squares in 4 ways, for example, as 36863232004 + 184078753936 = 191998^2 + 429044^2 .

It is a super-2 number, since 2×220941985940² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424888175 + ... + 424888694.

It is an arithmetic number, because the mean of its divisors is an integer number (20819533315).

Almost surely, 2^220941985940 is an apocalyptic number.

220941985940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220941985940 is an abundant number, since it is smaller than the sum of its proper divisors (278726813620).

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

220941985940 is a wasteful number, since it uses less digits than its factorization.

220941985940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849776891 (or 849776889 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 220941985940 in words is "two hundred twenty billion, nine hundred forty-one million, nine hundred eighty-five thousand, nine hundred forty".