20402225541 has 8 divisors (see below), whose sum is σ = 30225519360. Its totient is φ = 13601483676.

The previous prime is 20402225513. The next prime is 20402225549. The reversal of 20402225541 is 14552220402.

20402225541 is a `hidden beast` number, since 2 + 0 + 402 + 2 + 255 + 4 + 1 = 666.

It is not a de Polignac number, because 20402225541 - 2⁷ = 20402225413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 755637983 = 20402225541 / (2 + 0 + 4 + 0 + 2 + 2 + 2 + 5 + 5 + 4 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402225549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377818965 + ... + 377819018.

It is an arithmetic number, because the mean of its divisors is an integer number (3778189920).

Almost surely, 2^20402225541 is an apocalyptic number.

It is an amenable number.

20402225541 is a deficient number, since it is larger than the sum of its proper divisors (9823293819).

20402225541 is an equidigital number, since it uses as much as digits as its factorization.

20402225541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755637992 (or 755637986 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 20402225541 its reverse (14552220402), we get a palindrome (34954445943).

The spelling of 20402225541 in words is "twenty billion, four hundred two million, two hundred twenty-five thousand, five hundred forty-one".