20878115 has 16 divisors (see below), whose sum is σ = 26131680. Its totient is φ = 15993600.

The previous prime is 20878103. The next prime is 20878127. The reversal of 20878115 is 51187802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20878103) and next prime (20878127).

It is not a de Polignac number, because 20878115 - 2¹⁶ = 20812579 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19340 + ... + 20390.

It is an arithmetic number, because the mean of its divisors is an integer number (1633230).

Almost surely, 2^20878115 is an apocalyptic number.

20878115 is a deficient number, since it is larger than the sum of its proper divisors (5253565).

20878115 is a wasteful number, since it uses less digits than its factorization.

20878115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 20878115 is about 4569.2575983413. The cubic root of 20878115 is about 275.3576173878.

The spelling of 20878115 in words is "twenty million, eight hundred seventy-eight thousand, one hundred fifteen".