20878089 has 8 divisors (see below), whose sum is σ = 29047872. Its totient is φ = 13313520.

The previous prime is 20878087. The next prime is 20878103. The reversal of 20878089 is 98087802.

It is a happy number.

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

It is not a de Polignac number, because 20878089 - 2¹ = 20878087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20878089.

It is not an unprimeable number, because it can be changed into a prime (20878087) 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, 151222 + ... + 151359.

It is an arithmetic number, because the mean of its divisors is an integer number (3630984).

Almost surely, 2^20878089 is an apocalyptic number.

It is an amenable number.

20878089 is a deficient number, since it is larger than the sum of its proper divisors (8169783).

20878089 is a wasteful number, since it uses less digits than its factorization.

20878089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302607.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 20878089 is about 4569.2547532393. The cubic root of 20878089 is about 275.3575030847.

The spelling of 20878089 in words is "twenty million, eight hundred seventy-eight thousand, eighty-nine".