20198259261 has 12 divisors (see below), whose sum is σ = 29193439392. Its totient is φ = 13457117256.

The previous prime is 20198259253. The next prime is 20198259287. The reversal of 20198259261 is 16295289102.

It is a happy number.

It is not a de Polignac number, because 20198259261 - 2³ = 20198259253 is a prime.

It is a super-2 number, since 2×20198259261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20198255261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 683811 + ... + 712736.

It is an arithmetic number, because the mean of its divisors is an integer number (2432786616).

Almost surely, 2^20198259261 is an apocalyptic number.

It is an amenable number.

20198259261 is a deficient number, since it is larger than the sum of its proper divisors (8995180131).

20198259261 is a wasteful number, since it uses less digits than its factorization.

20198259261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398160 (or 1398157 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 20198259261 in words is "twenty billion, one hundred ninety-eight million, two hundred fifty-nine thousand, two hundred sixty-one".