20255400 has 288 divisors, whose sum is σ = 79161600. Its totient is φ = 4752000.

The previous prime is 20255399. The next prime is 20255413. The reversal of 20255400 is 455202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 653385 + ... + 653415.

Almost surely, 2^20255400 is an apocalyptic number.

20255400 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 20255400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39580800).

20255400 is an abundant number, since it is smaller than the sum of its proper divisors (58906200).

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

20255400 is a wasteful number, since it uses less digits than its factorization.

20255400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20255400 is about 4500.5999600053. The cubic root of 20255400 is about 272.5923150461.

The spelling of 20255400 in words is "twenty million, two hundred fifty-five thousand, four hundred".