20012915 has 8 divisors (see below), whose sum is σ = 25862928. Its totient is φ = 14778720.

The previous prime is 20012903. The next prime is 20012917. The reversal of 20012915 is 51921002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20012915 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20012917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153881 + ... + 154010.

It is an arithmetic number, because the mean of its divisors is an integer number (3232866).

Almost surely, 2^20012915 is an apocalyptic number.

20012915 is a deficient number, since it is larger than the sum of its proper divisors (5850013).

20012915 is a wasteful number, since it uses less digits than its factorization.

20012915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307909.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 20012915 is about 4473.5796628651. The cubic root of 20012915 is about 271.5001769266.

Adding to 20012915 its reverse (51921002), we get a palindrome (71933917).

The spelling of 20012915 in words is "twenty million, twelve thousand, nine hundred fifteen".