20149478258 has 54 divisors (see below), whose sum is σ = 38105892909. Its totient is φ = 7963995312.

The previous prime is 20149478183. The next prime is 20149478281. The reversal of 20149478258 is 85287494102.

It can be written as a sum of positive squares in 2 ways, for example, as 17228400049 + 2921078209 = 131257^2 + 54047^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=100373.

It is a super-2 number, since 2×20149478258² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18267335 + ... + 18268437.

Almost surely, 2^20149478258 is an apocalyptic number.

20149478258 is a deficient number, since it is larger than the sum of its proper divisors (17956414651).

20149478258 is an equidigital number, since it uses as much as digits as its factorization.

20149478258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

Multiplying 20149478258 by its sum of digits (50), we get a square (1007473912900 = 1003730²).

The spelling of 20149478258 in words is "twenty billion, one hundred forty-nine million, four hundred seventy-eight thousand, two hundred fifty-eight".