20346640654440 has 32 divisors (see below), whose sum is σ = 61039921963680. Its totient is φ = 5425770841152.

The previous prime is 20346640654429. The next prime is 20346640654451. The reversal of 20346640654440 is 4445604664302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20346640654429) and next prime (20346640654451).

It is a self number, because there is not a number n which added to its sum of digits gives 20346640654440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84777669274 + ... + 84777669513.

It is an arithmetic number, because the mean of its divisors is an integer number (1907497561365).

Almost surely, 2^{20346640654440} is an apocalyptic number.

20346640654440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20346640654440 is an abundant number, since it is smaller than the sum of its proper divisors (40693281309240).

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

20346640654440 is a wasteful number, since it uses less digits than its factorization.

20346640654440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169555338801 (or 169555338797 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 48.

The spelling of 20346640654440 in words is "twenty trillion, three hundred forty-six billion, six hundred forty million, six hundred fifty-four thousand, four hundred forty".