20537790 has 64 divisors (see below), whose sum is σ = 60673536. Its totient is φ = 4332672.

The previous prime is 20537773. The next prime is 20537813. The reversal of 20537790 is 9773502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1032 + ... + 6491.

It is an arithmetic number, because the mean of its divisors is an integer number (948024).

Almost surely, 2^20537790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20537790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30336768).

20537790 is an abundant number, since it is smaller than the sum of its proper divisors (40135746).

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

20537790 is a wasteful number, since it uses less digits than its factorization.

20537790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7553.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 20537790 is about 4531.8638549718. The cubic root of 20537790 is about 273.8532522665.

The spelling of 20537790 in words is "twenty million, five hundred thirty-seven thousand, seven hundred ninety".