20428541 has 12 divisors (see below), whose sum is σ = 24054912. Its totient is φ = 17295768.

The previous prime is 20428523. The next prime is 20428549. The reversal of 20428541 is 14582402.

It is a happy number.

It is not a de Polignac number, because 20428541 - 2¹⁴ = 20412157 is a prime.

20428541 is a Rhonda number in base 9.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20428541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1556 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (2004576).

Almost surely, 2^20428541 is an apocalyptic number.

It is an amenable number.

20428541 is a deficient number, since it is larger than the sum of its proper divisors (3626371).

20428541 is an equidigital number, since it uses as much as digits as its factorization.

20428541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120 (or 5113 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 20428541 is about 4519.7943537289. The cubic root of 20428541 is about 273.3668091394.

The spelling of 20428541 in words is "twenty million, four hundred twenty-eight thousand, five hundred forty-one".