20202020091 has 96 divisors (see below), whose sum is σ = 34742822400. Its totient is φ = 11171312640.

The previous prime is 20202020087. The next prime is 20202020099. The reversal of 20202020091 is 19002020202.

It is not a de Polignac number, because 20202020091 - 2² = 20202020087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20202020099) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 27336600 + ... + 27337338.

It is an arithmetic number, because the mean of its divisors is an integer number (361904400).

Almost surely, 2^20202020091 is an apocalyptic number.

20202020091 is a deficient number, since it is larger than the sum of its proper divisors (14540802309).

20202020091 is a wasteful number, since it uses less digits than its factorization.

20202020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20202020091 its reverse (19002020202), we get a palindrome (39204040293).

It can be divided in two parts, 202020 and 20091, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 20202020091 in words is "twenty billion, two hundred two million, twenty thousand, ninety-one".