20432920 has 16 divisors (see below), whose sum is σ = 45974160. Its totient is φ = 8173152.

The previous prime is 20432897. The next prime is 20432933. The reversal of 20432920 is 2923402.

It is a junction number, because it is equal to n+sod(n) for n = 20432891 and 20432900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255372 + ... + 255451.

It is an arithmetic number, because the mean of its divisors is an integer number (2873385).

Almost surely, 2^20432920 is an apocalyptic number.

20432920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20432920 is an abundant number, since it is smaller than the sum of its proper divisors (25541240).

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

20432920 is a wasteful number, since it uses less digits than its factorization.

20432920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510834 (or 510830 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20432920 is about 4520.2787524665. The cubic root of 20432920 is about 273.3863404369.

It can be divided in two parts, 204 and 32920, that added together give a square (33124 = 182²).

The spelling of 20432920 in words is "twenty million, four hundred thirty-two thousand, nine hundred twenty".