20511105351 has 32 divisors (see below), whose sum is σ = 30347170560. Its totient is φ = 12219072000.

The previous prime is 20511105337. The next prime is 20511105371. The reversal of 20511105351 is 15350111502.

It is not a de Polignac number, because 20511105351 - 2¹¹ = 20511103303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511105371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 441151 + ... + 485423.

It is an arithmetic number, because the mean of its divisors is an integer number (948349080).

Almost surely, 2^20511105351 is an apocalyptic number.

20511105351 is a deficient number, since it is larger than the sum of its proper divisors (9836065209).

20511105351 is a wasteful number, since it uses less digits than its factorization.

20511105351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44527.

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 20511105351 its reverse (15350111502), we get a palindrome (35861216853).

The spelling of 20511105351 in words is "twenty billion, five hundred eleven million, one hundred five thousand, three hundred fifty-one".