20102105540 has 48 divisors (see below), whose sum is σ = 46361246400. Its totient is φ = 7260785280.

The previous prime is 20102105509. The next prime is 20102105591. The reversal of 20102105540 is 4550120102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273842 + ... + 339401.

It is an arithmetic number, because the mean of its divisors is an integer number (965859300).

Almost surely, 2^20102105540 is an apocalyptic number.

20102105540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102105540 is an abundant number, since it is smaller than the sum of its proper divisors (26259140860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20102105540 is a wasteful number, since it uses less digits than its factorization.

20102105540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613412 (or 613410 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 20102105540 its reverse (4550120102), we get a palindrome (24652225642).

The spelling of 20102105540 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred forty".