20315602173 has 32 divisors (see below), whose sum is σ = 29077420032. Its totient is φ = 12583771200.

The previous prime is 20315602171. The next prime is 20315602183. The reversal of 20315602173 is 37120651302.

It is not a de Polignac number, because 20315602173 - 2¹ = 20315602171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20315602173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315602171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1604638 + ... + 1617248.

It is an arithmetic number, because the mean of its divisors is an integer number (908669376).

Almost surely, 2^20315602173 is an apocalyptic number.

20315602173 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20315602173 is a deficient number, since it is larger than the sum of its proper divisors (8761817859).

20315602173 is a wasteful number, since it uses less digits than its factorization.

20315602173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13305.

The product of its (nonzero) digits is 7560, while the sum is 30.

The spelling of 20315602173 in words is "twenty billion, three hundred fifteen million, six hundred two thousand, one hundred seventy-three".