20000251173 has 64 divisors (see below), whose sum is σ = 32105668608. Its totient is φ = 10835804160.

The previous prime is 20000251169. The next prime is 20000251207. The reversal of 20000251173 is 37115200002.

It is not a de Polignac number, because 20000251173 - 2² = 20000251169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000251153) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9384318 + ... + 9386448.

It is an arithmetic number, because the mean of its divisors is an integer number (501651072).

Almost surely, 2^20000251173 is an apocalyptic number.

It is an amenable number.

20000251173 is a deficient number, since it is larger than the sum of its proper divisors (12105417435).

20000251173 is a wasteful number, since it uses less digits than its factorization.

20000251173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482.

The product of its (nonzero) digits is 420, while the sum is 21.

Adding to 20000251173 its reverse (37115200002), we get a palindrome (57115451175).

The spelling of 20000251173 in words is "twenty billion, two hundred fifty-one thousand, one hundred seventy-three".