20873790 has 96 divisors (see below), whose sum is σ = 65707200. Its totient is φ = 4488192.

The previous prime is 20873789. The next prime is 20873803. The reversal of 20873790 is 9737802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9736 + ... + 11684.

It is an arithmetic number, because the mean of its divisors is an integer number (684450).

Almost surely, 2^20873790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20873790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32853600).

20873790 is an abundant number, since it is smaller than the sum of its proper divisors (44833410).

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

20873790 is a wasteful number, since it uses less digits than its factorization.

20873790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20873790 is about 4568.7843021968. The cubic root of 20873790 is about 275.3386021983.

The spelling of 20873790 in words is "twenty million, eight hundred seventy-three thousand, seven hundred ninety".