20460020660 has 12 divisors (see below), whose sum is σ = 42966043428. Its totient is φ = 8184008256.

The previous prime is 20460020639. The next prime is 20460020701. The reversal of 20460020660 is 6602006402.

It can be written as a sum of positive squares in 2 ways, for example, as 11801345956 + 8658674704 = 108634^2 + 93052^2 .

It is a super-2 number, since 2×20460020660² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 511500497 + ... + 511500536.

It is an arithmetic number, because the mean of its divisors is an integer number (3580503619).

Almost surely, 2^20460020660 is an apocalyptic number.

20460020660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20460020660 is an abundant number, since it is smaller than the sum of its proper divisors (22506022768).

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

20460020660 is a wasteful number, since it uses less digits than its factorization.

20460020660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023001042 (or 1023001040 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The spelling of 20460020660 in words is "twenty billion, four hundred sixty million, twenty thousand, six hundred sixty".