20858080 has 24 divisors (see below), whose sum is σ = 49277592. Its totient is φ = 8343168.

The previous prime is 20858077. The next prime is 20858081. The reversal of 20858080 is 8085802.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65022 + ... + 65341.

It is an arithmetic number, because the mean of its divisors is an integer number (2053233).

Almost surely, 2^20858080 is an apocalyptic number.

20858080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20858080 is an abundant number, since it is smaller than the sum of its proper divisors (28419512).

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

20858080 is a wasteful number, since it uses less digits than its factorization.

20858080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130378 (or 130370 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 20858080 is about 4567.0647028480. The cubic root of 20858080 is about 275.2695098890.

The spelling of 20858080 in words is "twenty million, eight hundred fifty-eight thousand, eighty".