20312500166640 has 120 divisors (see below), whose sum is σ = 74417614275888. Its totient is φ = 4924242462720.

The previous prime is 20312500166617. The next prime is 20312500166669. The reversal of 20312500166640 is 4666100521302.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a junction number, because it is equal to n+sod(n) for n = 20312500166595 and 20312500166604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1282346889 + ... + 1282362728.

Almost surely, 2^{20312500166640} is an apocalyptic number.

20312500166640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312500166640 is an abundant number, since it is smaller than the sum of its proper divisors (54105114109248).

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

20312500166640 is a wasteful number, since it uses less digits than its factorization.

20312500166640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564709647 (or 2564709638 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 20312500166640 its reverse (4666100521302), we get a palindrome (24978600687942).

The spelling of 20312500166640 in words is "twenty trillion, three hundred twelve billion, five hundred million, one hundred sixty-six thousand, six hundred forty".