20415504171 has 8 divisors (see below), whose sum is σ = 27956366224. Its totient is φ = 13242489120.

The previous prime is 20415504113. The next prime is 20415504173. The reversal of 20415504171 is 17140551402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20415504171 - 2¹⁵ = 20415471403 is a prime.

It is a super-2 number, since 2×20415504171² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415504173) 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, 91961620 + ... + 91961841.

It is an arithmetic number, because the mean of its divisors is an integer number (3494545778).

Almost surely, 2^20415504171 is an apocalyptic number.

20415504171 is a deficient number, since it is larger than the sum of its proper divisors (7540862053).

20415504171 is a wasteful number, since it uses less digits than its factorization.

20415504171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183923501.

The product of its (nonzero) digits is 5600, while the sum is 30.

The spelling of 20415504171 in words is "twenty billion, four hundred fifteen million, five hundred four thousand, one hundred seventy-one".