20835240 has 64 divisors (see below), whose sum is σ = 65232000. Its totient is φ = 5313792.

The previous prime is 20835233. The next prime is 20835289. The reversal of 20835240 is 4253802.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20835240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (1019250).

Almost surely, 2^20835240 is an apocalyptic number.

20835240 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 20835240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32616000).

20835240 is an abundant number, since it is smaller than the sum of its proper divisors (44396760).

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

20835240 is a wasteful number, since it uses less digits than its factorization.

20835240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7586 (or 7582 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20835240 is about 4564.5635059664. The cubic root of 20835240 is about 275.1689980513.

The spelling of 20835240 in words is "twenty million, eight hundred thirty-five thousand, two hundred forty".