20018122515 has 48 divisors (see below), whose sum is σ = 36055000800. Its totient is φ = 10655027712.

The previous prime is 20018122513. The next prime is 20018122529. The reversal of 20018122515 is 51522181002.

It is a happy number.

20018122515 is a `hidden beast` number, since 20 + 0 + 1 + 8 + 122 + 515 = 666.

It is not a de Polignac number, because 20018122515 - 2¹ = 20018122513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20018122511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 602251 + ... + 634619.

It is an arithmetic number, because the mean of its divisors is an integer number (751145850).

Almost surely, 2^20018122515 is an apocalyptic number.

20018122515 is a deficient number, since it is larger than the sum of its proper divisors (16036878285).

20018122515 is an equidigital number, since it uses as much as digits as its factorization.

20018122515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32898 (or 32886 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The spelling of 20018122515 in words is "twenty billion, eighteen million, one hundred twenty-two thousand, five hundred fifteen".