20255428 has 12 divisors (see below), whose sum is σ = 36405292. Its totient is φ = 9853920.

The previous prime is 20255423. The next prime is 20255429. The reversal of 20255428 is 82455202.

It can be written as a sum of positive squares in 2 ways, for example, as 11505664 + 8749764 = 3392^2 + 2958^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20255396 and 20255405.

It is not an unprimeable number, because it can be changed into a prime (20255423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68283 + ... + 68578.

Almost surely, 2^20255428 is an apocalyptic number.

It is an amenable number.

20255428 is a deficient number, since it is larger than the sum of its proper divisors (16149864).

20255428 is a wasteful number, since it uses less digits than its factorization.

20255428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136902 (or 136900 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 20255428 is about 4500.6030707006. The cubic root of 20255428 is about 272.5924406518.

The spelling of 20255428 in words is "twenty million, two hundred fifty-five thousand, four hundred twenty-eight".