20255420 has 12 divisors (see below), whose sum is σ = 42536424. Its totient is φ = 8102160.

The previous prime is 20255413. The next prime is 20255423. The reversal of 20255420 is 2455202.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1012771 = 20255420 / (2 + 0 + 2 + 5 + 5 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 20255392 and 20255401.

It is a congruent number.

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, 506366 + ... + 506405.

It is an arithmetic number, because the mean of its divisors is an integer number (3544702).

Almost surely, 2^20255420 is an apocalyptic number.

20255420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20255420 is an abundant number, since it is smaller than the sum of its proper divisors (22281004).

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

20255420 is a wasteful number, since it uses less digits than its factorization.

20255420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012780 (or 1012778 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20255420 is about 4500.6021819308. The cubic root of 20255420 is about 272.5924047645.

The spelling of 20255420 in words is "twenty million, two hundred fifty-five thousand, four hundred twenty".