20089840 has 40 divisors (see below), whose sum is σ = 49170960. Its totient is φ = 7612416.

The previous prime is 20089831. The next prime is 20089843. The reversal of 20089840 is 4898002.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20089843) 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, 5089 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (1229274).

Almost surely, 2^20089840 is an apocalyptic number.

20089840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20089840 is an abundant number, since it is smaller than the sum of its proper divisors (29081120).

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

20089840 is a wasteful number, since it uses less digits than its factorization.

20089840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13249 (or 13243 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20089840 is about 4482.1691177375. The cubic root of 20089840 is about 271.8475933971.

The spelling of 20089840 in words is "twenty million, eighty-nine thousand, eight hundred forty".