20533880 has 16 divisors (see below), whose sum is σ = 46201320. Its totient is φ = 8213536.

The previous prime is 20533867. The next prime is 20533883. The reversal of 20533880 is 8833502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256634 + ... + 256713.

Almost surely, 2^20533880 is an apocalyptic number.

20533880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533880 is an abundant number, since it is smaller than the sum of its proper divisors (25667440).

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

20533880 is a wasteful number, since it uses less digits than its factorization.

20533880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513358 (or 513354 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20533880 is about 4531.4324446029. The cubic root of 20533880 is about 273.8358723670.

The spelling of 20533880 in words is "twenty million, five hundred thirty-three thousand, eight hundred eighty".