20432880 has 240 divisors, whose sum is σ = 77182560. Its totient is φ = 4810752.

The previous prime is 20432879. The next prime is 20432897. The reversal of 20432880 is 8823402.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 346291 + ... + 346349.

It is an arithmetic number, because the mean of its divisors is an integer number (321594).

Almost surely, 2^20432880 is an apocalyptic number.

20432880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20432880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38591280).

20432880 is an abundant number, since it is smaller than the sum of its proper divisors (56749680).

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

20432880 is a wasteful number, since it uses less digits than its factorization.

20432880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20432880 is about 4520.2743279584. The cubic root of 20432880 is about 273.3861620408.

It can be divided in two parts, 20432 and 880, that added together give a palindrome (21312).

The spelling of 20432880 in words is "twenty million, four hundred thirty-two thousand, eight hundred eighty".