20379889 has 12 divisors (see below), whose sum is σ = 21983076. Its totient is φ = 18826752.

The previous prime is 20379841. The next prime is 20379899. The reversal of 20379889 is 98897302.

It can be written as a sum of positive squares in 2 ways, for example, as 6630625 + 13749264 = 2575^2 + 3708^2 .

It is not a de Polignac number, because 20379889 - 2¹⁵ = 20347121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20379809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180297 + ... + 180409.

It is an arithmetic number, because the mean of its divisors is an integer number (1831923).

Almost surely, 2^20379889 is an apocalyptic number.

It is an amenable number.

20379889 is a deficient number, since it is larger than the sum of its proper divisors (1603187).

20379889 is a wasteful number, since it uses less digits than its factorization.

20379889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 20379889 is about 4514.4090421671. The cubic root of 20379889 is about 273.1496225709.

The spelling of 20379889 in words is "twenty million, three hundred seventy-nine thousand, eight hundred eighty-nine".