20275665440 has 24 divisors (see below), whose sum is σ = 47901259980. Its totient is φ = 8110266112.

The previous prime is 20275665437. The next prime is 20275665467. The reversal of 20275665440 is 4456657202.

It can be written as a sum of positive squares in 2 ways, for example, as 19422324496 + 853340944 = 139364^2 + 29212^2 .

It is a super-2 number, since 2×20275665440² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63361295 + ... + 63361614.

Almost surely, 2^20275665440 is an apocalyptic number.

20275665440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20275665440 is an abundant number, since it is smaller than the sum of its proper divisors (27625594540).

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

20275665440 is a wasteful number, since it uses less digits than its factorization.

20275665440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126722924 (or 126722916 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20275665440 in words is "twenty billion, two hundred seventy-five million, six hundred sixty-five thousand, four hundred forty".