20484840 has 32 divisors (see below), whose sum is σ = 61454880. Its totient is φ = 5462592.

The previous prime is 20484833. The next prime is 20484851. The reversal of 20484840 is 4848402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20484798 and 20484807.

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 7 ways as a sum of consecutive naturals, for example, 85234 + ... + 85473.

It is an arithmetic number, because the mean of its divisors is an integer number (1920465).

Almost surely, 2^20484840 is an apocalyptic number.

20484840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20484840 is an abundant number, since it is smaller than the sum of its proper divisors (40970040).

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

20484840 is a wasteful number, since it uses less digits than its factorization.

20484840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170721 (or 170717 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 20484840 is about 4526.0181175068. The cubic root of 20484840 is about 273.6177025925.

The spelling of 20484840 in words is "twenty million, four hundred eighty-four thousand, eight hundred forty".