20788920 has 64 divisors (see below), whose sum is σ = 69300000. Its totient is φ = 5543424.

The previous prime is 20788919. The next prime is 20788921. The reversal of 20788920 is 2988702.

It is an interprime number because it is at equal distance from previous prime (20788919) and next prime (20788921).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20788921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8545 + ... + 10704.

Almost surely, 2^20788920 is an apocalyptic number.

20788920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20788920 is an abundant number, since it is smaller than the sum of its proper divisors (48511080).

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

20788920 is a wasteful number, since it uses less digits than its factorization.

20788920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19269 (or 19259 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20788920 is about 4559.4868132280. The cubic root of 20788920 is about 274.9649321675.

The spelling of 20788920 in words is "twenty million, seven hundred eighty-eight thousand, nine hundred twenty".