20788880 has 40 divisors (see below), whose sum is σ = 55240512. Its totient is φ = 7127424.

The previous prime is 20788877. The next prime is 20788903. The reversal of 20788880 is 8888702.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18002 + ... + 19121.

Almost surely, 2^20788880 is an apocalyptic number.

20788880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20788880 is an abundant number, since it is smaller than the sum of its proper divisors (34451632).

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

20788880 is a wasteful number, since it uses less digits than its factorization.

20788880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37143 (or 37137 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 41.

The square root of 20788880 is about 4559.4824267673. The cubic root of 20788880 is about 274.9647558139.

The spelling of 20788880 in words is "twenty million, seven hundred eighty-eight thousand, eight hundred eighty".