20506878 has 32 divisors (see below), whose sum is σ = 52081920. Its totient is φ = 5859000.

The previous prime is 20506877. The next prime is 20506897. The reversal of 20506878 is 87860502.

20506878 is nontrivially palindromic in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26748 + ... + 27503.

It is an arithmetic number, because the mean of its divisors is an integer number (1627560).

Almost surely, 2^20506878 is an apocalyptic number.

20506878 is an abundant number, since it is smaller than the sum of its proper divisors (31575042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20506878 is a wasteful number, since it uses less digits than its factorization.

20506878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54269 (or 54263 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 20506878 is about 4528.4520534063. The cubic root of 20506878 is about 273.7157885563.

The spelling of 20506878 in words is "twenty million, five hundred six thousand, eight hundred seventy-eight".