20102105541 has 8 divisors (see below), whose sum is σ = 30631779904. Its totient is φ = 11486917440.

The previous prime is 20102105509. The next prime is 20102105591. The reversal of 20102105541 is 14550120102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20102105541 - 2⁵ = 20102105509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 957243121 = 20102105541 / (2 + 0 + 1 + 0 + 2 + 1 + 0 + 5 + 5 + 4 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102105591) 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, 478621540 + ... + 478621581.

It is an arithmetic number, because the mean of its divisors is an integer number (3828972488).

Almost surely, 2^20102105541 is an apocalyptic number.

20102105541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20102105541 is a deficient number, since it is larger than the sum of its proper divisors (10529674363).

20102105541 is an equidigital number, since it uses as much as digits as its factorization.

20102105541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957243131.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 20102105541 its reverse (14550120102), we get a palindrome (34652225643).

The spelling of 20102105541 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred forty-one".