20255380 has 12 divisors (see below), whose sum is σ = 42536340. Its totient is φ = 8102144.

The previous prime is 20255371. The next prime is 20255393. The reversal of 20255380 is 8355202.

It can be written as a sum of positive squares in 2 ways, for example, as 14243076 + 6012304 = 3774^2 + 2452^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506365 + ... + 506404.

It is an arithmetic number, because the mean of its divisors is an integer number (3544695).

Almost surely, 2^20255380 is an apocalyptic number.

20255380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20255380 is an abundant number, since it is smaller than the sum of its proper divisors (22280960).

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

20255380 is a wasteful number, since it uses less digits than its factorization.

20255380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012778 (or 1012776 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20255380 is about 4500.5977380788. The cubic root of 20255380 is about 272.5922253277.

It can be divided in two parts, 20 and 255380, that multiplied together give a square (5107600 = 2260²).

The spelling of 20255380 in words is "twenty million, two hundred fifty-five thousand, three hundred eighty".