20428455 has 32 divisors (see below), whose sum is σ = 34110720. Its totient is φ = 10430720.

The previous prime is 20428433. The next prime is 20428459. The reversal of 20428455 is 55482402.

It is not a de Polignac number, because 20428455 - 2⁵ = 20428423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36004 + ... + 36566.

It is an arithmetic number, because the mean of its divisors is an integer number (1065960).

Almost surely, 2^20428455 is an apocalyptic number.

20428455 is a deficient number, since it is larger than the sum of its proper divisors (13682265).

20428455 is a wasteful number, since it uses less digits than its factorization.

20428455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 20428455 is about 4519.7848400117. The cubic root of 20428455 is about 273.3664255327.

The spelling of 20428455 in words is "twenty million, four hundred twenty-eight thousand, four hundred fifty-five".