20545800 has 144 divisors (see below), whose sum is σ = 70255920. Its totient is φ = 4963200.

The previous prime is 20545781. The next prime is 20545807. The reversal of 20545800 is 854502.

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

It is not an unprimeable number, because it can be changed into a prime (20545807) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 72459 + ... + 72741.

Almost surely, 2^20545800 is an apocalyptic number.

20545800 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 20545800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35127960).

20545800 is an abundant number, since it is smaller than the sum of its proper divisors (49710120).

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

20545800 is a wasteful number, since it uses less digits than its factorization.

20545800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20545800 is about 4532.7475111680. The cubic root of 20545800 is about 273.8888497259. Note that the first 4 decimals are identical.

The spelling of 20545800 in words is "twenty million, five hundred forty-five thousand, eight hundred".