20011515015 has 16 divisors (see below), whose sum is σ = 32622546528. Its totient is φ = 10471433856.

The previous prime is 20011514993. The next prime is 20011515019. The reversal of 20011515015 is 51051511002.

It is a de Polignac number, because none of the positive numbers 2^k-20011515015 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011514982 and 20011515000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011515019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12585064 + ... + 12586653.

It is an arithmetic number, because the mean of its divisors is an integer number (2038909158).

Almost surely, 2^20011515015 is an apocalyptic number.

20011515015 is a deficient number, since it is larger than the sum of its proper divisors (12611031513).

20011515015 is a wasteful number, since it uses less digits than its factorization.

20011515015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25171778.

The product of its (nonzero) digits is 250, while the sum is 21.

The spelling of 20011515015 in words is "twenty billion, eleven million, five hundred fifteen thousand, fifteen".