20511226261406 has 16 divisors (see below), whose sum is σ = 31013194168320. Its totient is φ = 10173681718200.

The previous prime is 20511226261387. The next prime is 20511226261417. The reversal of 20511226261406 is 60416262211502.

It is a self number, because there is not a number n which added to its sum of digits gives 20511226261406.

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, 46491566 + ... + 46930673.

It is an arithmetic number, because the mean of its divisors is an integer number (1938324635520).

Almost surely, 2^{20511226261406} is an apocalyptic number.

20511226261406 is a deficient number, since it is larger than the sum of its proper divisors (10501967906914).

20511226261406 is a wasteful number, since it uses less digits than its factorization.

20511226261406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93423119.

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 20511226261406 its reverse (60416262211502), we get a palindrome (80927488472908).

The spelling of 20511226261406 in words is "twenty trillion, five hundred eleven billion, two hundred twenty-six million, two hundred sixty-one thousand, four hundred six".