20457800 has 96 divisors (see below), whose sum is σ = 55041120. Its totient is φ = 6988800.

The previous prime is 20457793. The next prime is 20457803. The reversal of 20457800 is 875402.

It is a self number, because there is not a number n which added to its sum of digits gives 20457800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20457803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37127 + ... + 37673.

It is an arithmetic number, because the mean of its divisors is an integer number (573345).

Almost surely, 2^20457800 is an apocalyptic number.

20457800 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 20457800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27520560).

20457800 is an abundant number, since it is smaller than the sum of its proper divisors (34583320).

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

20457800 is a wasteful number, since it uses less digits than its factorization.

20457800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 20457800 is about 4523.0299578933. The cubic root of 20457800 is about 273.4972577422.

The spelling of 20457800 in words is "twenty million, four hundred fifty-seven thousand, eight hundred".