20105421510 has 16 divisors (see below), whose sum is σ = 48253011696. Its totient is φ = 5361445728.

The previous prime is 20105421499. The next prime is 20105421529. The reversal of 20105421510 is 1512450102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335090329 + ... + 335090388.

It is an arithmetic number, because the mean of its divisors is an integer number (3015813231).

Almost surely, 2^20105421510 is an apocalyptic number.

20105421510 is an abundant number, since it is smaller than the sum of its proper divisors (28147590186).

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

20105421510 is a wasteful number, since it uses less digits than its factorization.

20105421510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670180727.

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

Adding to 20105421510 its reverse (1512450102), we get a palindrome (21617871612).

The spelling of 20105421510 in words is "twenty billion, one hundred five million, four hundred twenty-one thousand, five hundred ten".