20255438 has 16 divisors (see below), whose sum is σ = 34802784. Its totient is φ = 8661120.

The previous prime is 20255429. The next prime is 20255441. The reversal of 20255438 is 83455202.

It is a self number, because there is not a number n which added to its sum of digits gives 20255438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5906 + ... + 8682.

It is an arithmetic number, because the mean of its divisors is an integer number (2175174).

Almost surely, 2^20255438 is an apocalyptic number.

20255438 is a deficient number, since it is larger than the sum of its proper divisors (14547346).

20255438 is a wasteful number, since it uses less digits than its factorization.

20255438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3307.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 20255438 is about 4500.6041816627. The cubic root of 20255438 is about 272.5924855109.

The spelling of 20255438 in words is "twenty million, two hundred fifty-five thousand, four hundred thirty-eight".