20966371761 has 16 divisors (see below), whose sum is σ = 28722028608. Its totient is φ = 13596172800.

The previous prime is 20966371753. The next prime is 20966371837. The reversal of 20966371761 is 16717366902.

It is a happy number.

It is not a de Polignac number, because 20966371761 - 2³ = 20966371753 is a prime.

It is a super-2 number, since 2×20966371761² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20966371761.

It is not an unprimeable number, because it can be changed into a prime (20966373761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211455 + ... + 294356.

It is an arithmetic number, because the mean of its divisors is an integer number (1795126788).

Almost surely, 2^20966371761 is an apocalyptic number.

It is an amenable number.

20966371761 is a deficient number, since it is larger than the sum of its proper divisors (7755656847).

20966371761 is a wasteful number, since it uses less digits than its factorization.

20966371761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506192.

The product of its (nonzero) digits is 571536, while the sum is 48.

The spelling of 20966371761 in words is "twenty billion, nine hundred sixty-six million, three hundred seventy-one thousand, seven hundred sixty-one".