20150015 has 32 divisors (see below), whose sum is σ = 27086400. Its totient is φ = 14321664.

The previous prime is 20149973. The next prime is 20150021. The reversal of 20150015 is 51005102.

It is not a de Polignac number, because 20150015 - 2⁶ = 20149951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135161 + ... + 135309.

It is an arithmetic number, because the mean of its divisors is an integer number (846450).

Almost surely, 2^20150015 is an apocalyptic number.

20150015 is a deficient number, since it is larger than the sum of its proper divisors (6936385).

20150015 is a wasteful number, since it uses less digits than its factorization.

20150015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 20150015 is about 4488.8768082896. The cubic root of 20150015 is about 272.1187441095.

Adding to 20150015 its reverse (51005102), we get a palindrome (71155117).

The spelling of 20150015 in words is "twenty million, one hundred fifty thousand, fifteen".