20511014405 has 32 divisors (see below), whose sum is σ = 30035073024. Its totient is φ = 13140300096.

The previous prime is 20511014401. The next prime is 20511014423. The reversal of 20511014405 is 50441011502.

It is not a de Polignac number, because 20511014405 - 2² = 20511014401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511014401) 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, 261659 + ... + 330888.

It is an arithmetic number, because the mean of its divisors is an integer number (938596032).

Almost surely, 2^20511014405 is an apocalyptic number.

It is an amenable number.

20511014405 is a deficient number, since it is larger than the sum of its proper divisors (9524058619).

20511014405 is a wasteful number, since it uses less digits than its factorization.

20511014405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592625.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 20511014405 its reverse (50441011502), we get a palindrome (70952025907).

The spelling of 20511014405 in words is "twenty billion, five hundred eleven million, fourteen thousand, four hundred five".