20147915 has 8 divisors (see below), whose sum is σ = 24368640. Its totient is φ = 15990912.

The previous prime is 20147903. The next prime is 20147917. The reversal of 20147915 is 51974102.

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

It is a cyclic number.

It is not a de Polignac number, because 20147915 - 2⁴ = 20147899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20147917) 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, 15230 + ... + 16499.

It is an arithmetic number, because the mean of its divisors is an integer number (3046080).

Almost surely, 2^20147915 is an apocalyptic number.

20147915 is a deficient number, since it is larger than the sum of its proper divisors (4220725).

20147915 is a wasteful number, since it uses less digits than its factorization.

20147915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31861.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 20147915 is about 4488.6428906742. The cubic root of 20147915 is about 272.1092905315.

The spelling of 20147915 in words is "twenty million, one hundred forty-seven thousand, nine hundred fifteen".