20497649111 has 2 divisors, whose sum is σ = 20497649112. Its totient is φ = 20497649110.

The previous prime is 20497649083. The next prime is 20497649147. The reversal of 20497649111 is 11194679402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20497649111 - 2¹⁸ = 20497386967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20497649311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10248824555 + 10248824556.

It is an arithmetic number, because the mean of its divisors is an integer number (10248824556).

Almost surely, 2^20497649111 is an apocalyptic number.

20497649111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20497649111 is an equidigital number, since it uses as much as digits as its factorization.

20497649111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 20497649111 in words is "twenty billion, four hundred ninety-seven million, six hundred forty-nine thousand, one hundred eleven".