20788500 has 48 divisors (see below), whose sum is σ = 60540480. Its totient is φ = 5543200.

The previous prime is 20788499. The next prime is 20788513. The reversal of 20788500 is 588702.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5430 + ... + 8429.

It is an arithmetic number, because the mean of its divisors is an integer number (1261260).

Almost surely, 2^20788500 is an apocalyptic number.

20788500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20788500 is an abundant number, since it is smaller than the sum of its proper divisors (39751980).

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

20788500 is a wasteful number, since it uses less digits than its factorization.

20788500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13881 (or 13869 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 20788500 is about 4559.4407551804. The cubic root of 20788500 is about 274.9630804431.

The spelling of 20788500 in words is "twenty million, seven hundred eighty-eight thousand, five hundred".