20001515275 has 24 divisors (see below), whose sum is σ = 28350756864. Its totient is φ = 13712541600.

The previous prime is 20001515269. The next prime is 20001515309. The reversal of 20001515275 is 57251510002.

It is not a de Polignac number, because 20001515275 - 2¹¹ = 20001513227 is a prime.

It is a super-2 number, since 2×20001515275² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1234980 + ... + 1251070.

It is an arithmetic number, because the mean of its divisors is an integer number (1181281536).

Almost surely, 2^20001515275 is an apocalyptic number.

20001515275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20001515275 is a deficient number, since it is larger than the sum of its proper divisors (8349241589).

20001515275 is a wasteful number, since it uses less digits than its factorization.

20001515275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23211 (or 23206 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 28.

The spelling of 20001515275 in words is "twenty billion, one million, five hundred fifteen thousand, two hundred seventy-five".