20105421544 has 32 divisors (see below), whose sum is σ = 40645258920. Its totient is φ = 9268505856.

The previous prime is 20105421541. The next prime is 20105421559. The reversal of 20105421544 is 44512450102.

It can be written as a sum of positive squares in 4 ways, for example, as 6588568900 + 13516852644 = 81170^2 + 116262^2 .

It is not an unprimeable number, because it can be changed into a prime (20105421541) 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, 24607 + ... + 202030.

Almost surely, 2^20105421544 is an apocalyptic number.

It is an amenable number.

20105421544 is an abundant number, since it is smaller than the sum of its proper divisors (20539837376).

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

20105421544 is a wasteful number, since it uses less digits than its factorization.

20105421544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227509 (or 227505 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 20105421544 its reverse (44512450102), we get a palindrome (64617871646).

The spelling of 20105421544 in words is "twenty billion, one hundred five million, four hundred twenty-one thousand, five hundred forty-four".