20149915 has 8 divisors (see below), whose sum is σ = 24541200. Its totient is φ = 15879072.

The previous prime is 20149891. The next prime is 20149931. The reversal of 20149915 is 51994102.

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 20149915 - 2¹¹ = 20147867 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29740 + ... + 30409.

It is an arithmetic number, because the mean of its divisors is an integer number (3067650).

Almost surely, 2^20149915 is an apocalyptic number.

20149915 is a deficient number, since it is larger than the sum of its proper divisors (4391285).

20149915 is an equidigital number, since it uses as much as digits as its factorization.

20149915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60221.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 20149915 is about 4488.8656696319. The cubic root of 20149915 is about 272.1182939540.

The spelling of 20149915 in words is "twenty million, one hundred forty-nine thousand, nine hundred fifteen".