20833440 has 48 divisors (see below), whose sum is σ = 65626848. Its totient is φ = 5555456.

The previous prime is 20833433. The next prime is 20833441. The reversal of 20833440 is 4433802.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

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 20833440.

It is not an unprimeable number, because it can be changed into a prime (20833441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21222 + ... + 22181.

It is an arithmetic number, because the mean of its divisors is an integer number (1367226).

Almost surely, 2^20833440 is an apocalyptic number.

20833440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20833440 is an abundant number, since it is smaller than the sum of its proper divisors (44793408).

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

20833440 is a wasteful number, since it uses less digits than its factorization.

20833440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43421 (or 43413 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20833440 is about 4564.3663306093. The cubic root of 20833440 is about 275.1610736812.

The spelling of 20833440 in words is "twenty million, eight hundred thirty-three thousand, four hundred forty".