20511105316 has 24 divisors (see below), whose sum is σ = 38676927744. Its totient is φ = 9461427360.

The previous prime is 20511105299. The next prime is 20511105323. The reversal of 20511105316 is 61350111502.

It is a happy 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, 13390 + ... + 202981.

It is an arithmetic number, because the mean of its divisors is an integer number (1611538656).

Almost surely, 2^20511105316 is an apocalyptic number.

20511105316 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20511105316 is a deficient number, since it is larger than the sum of its proper divisors (18165822428).

20511105316 is a wasteful number, since it uses less digits than its factorization.

20511105316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218211 (or 218209 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 20511105316 its reverse (61350111502), we get a palindrome (81861216818).

The spelling of 20511105316 in words is "twenty billion, five hundred eleven million, one hundred five thousand, three hundred sixteen".