20516126155 has 16 divisors (see below), whose sum is σ = 29359724544. Its totient is φ = 13456539360.

The previous prime is 20516126153. The next prime is 20516126203. The reversal of 20516126155 is 55162161502.

It is not a de Polignac number, because 20516126155 - 2¹ = 20516126153 is a prime.

It is a super-2 number, since 2×20516126155² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20516126155.

It is not an unprimeable number, because it can be changed into a prime (20516126153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12742131 + ... + 12743740.

It is an arithmetic number, because the mean of its divisors is an integer number (1834982784).

Almost surely, 2^20516126155 is an apocalyptic number.

20516126155 is a deficient number, since it is larger than the sum of its proper divisors (8843598389).

20516126155 is a wasteful number, since it uses less digits than its factorization.

20516126155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25485906.

The product of its (nonzero) digits is 18000, while the sum is 34.

Adding to 20516126155 its reverse (55162161502), we get a palindrome (75678287657).

The spelling of 20516126155 in words is "twenty billion, five hundred sixteen million, one hundred twenty-six thousand, one hundred fifty-five".