20891110022 has 16 divisors (see below), whose sum is σ = 31552077312. Its totient is φ = 10373785800.

The previous prime is 20891110021. The next prime is 20891110061. The reversal of 20891110022 is 22001119802.

It is a junction number, because it is equal to n+sod(n) for n = 20891109973 and 20891110000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20891110021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1893173 + ... + 1904175.

It is an arithmetic number, because the mean of its divisors is an integer number (1972004832).

Almost surely, 2^20891110022 is an apocalyptic number.

20891110022 is a deficient number, since it is larger than the sum of its proper divisors (10660967290).

20891110022 is a wasteful number, since it uses less digits than its factorization.

20891110022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17443.

The product of its (nonzero) digits is 576, while the sum is 26.

Adding to 20891110022 its reverse (22001119802), we get a palindrome (42892229824).

It can be divided in two parts, 2089 and 1110022, that added together give a palindrome (1112111).

The spelling of 20891110022 in words is "twenty billion, eight hundred ninety-one million, one hundred ten thousand, twenty-two".