20179171953 has 8 divisors (see below), whose sum is σ = 29895069600. Its totient is φ = 13452781284.

The previous prime is 20179171937. The next prime is 20179171979. The reversal of 20179171953 is 35917197102.

It is a happy number.

It is not a de Polignac number, because 20179171953 - 2⁴ = 20179171937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20179171899 and 20179171908.

It is not an unprimeable number, because it can be changed into a prime (20179171933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373688343 + ... + 373688396.

It is an arithmetic number, because the mean of its divisors is an integer number (3736883700).

Almost surely, 2^20179171953 is an apocalyptic number.

It is an amenable number.

20179171953 is a deficient number, since it is larger than the sum of its proper divisors (9715897647).

20179171953 is an equidigital number, since it uses as much as digits as its factorization.

20179171953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747376748 (or 747376742 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 45.

The spelling of 20179171953 in words is "twenty billion, one hundred seventy-nine million, one hundred seventy-one thousand, nine hundred fifty-three".