20255493 has 16 divisors (see below), whose sum is σ = 28002816. Its totient is φ = 13009920.

The previous prime is 20255447. The next prime is 20255509. The reversal of 20255493 is 39455202.

It is not a de Polignac number, because 20255493 - 2⁶ = 20255429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20255493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32521 + ... + 33137.

It is an arithmetic number, because the mean of its divisors is an integer number (1750176).

Almost surely, 2^20255493 is an apocalyptic number.

It is an amenable number.

20255493 is a deficient number, since it is larger than the sum of its proper divisors (7747323).

20255493 is a wasteful number, since it uses less digits than its factorization.

20255493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 20255493 is about 4500.6102919493. The cubic root of 20255493 is about 272.5927322360.

The spelling of 20255493 in words is "twenty million, two hundred fifty-five thousand, four hundred ninety-three".