20197611311 has 16 divisors (see below), whose sum is σ = 21753041184. Its totient is φ = 18684785664.

The previous prime is 20197611307. The next prime is 20197611323. The reversal of 20197611311 is 11311679102.

It is not a de Polignac number, because 20197611311 - 2² = 20197611307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197611331) 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, 335840 + ... + 391386.

It is an arithmetic number, because the mean of its divisors is an integer number (1359565074).

Almost surely, 2^20197611311 is an apocalyptic number.

20197611311 is a deficient number, since it is larger than the sum of its proper divisors (1555429873).

20197611311 is a wasteful number, since it uses less digits than its factorization.

20197611311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55930.

The product of its (nonzero) digits is 2268, while the sum is 32.

The spelling of 20197611311 in words is "twenty billion, one hundred ninety-seven million, six hundred eleven thousand, three hundred eleven".