20098439261 has 8 divisors (see below), whose sum is σ = 21288359160. Its totient is φ = 18909370368.

The previous prime is 20098439243. The next prime is 20098439287. The reversal of 20098439261 is 16293489002.

It can be written as a sum of positive squares in 4 ways, for example, as 2304480025 + 17793959236 = 48005^2 + 133394^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20098439261 - 2⁶ = 20098439197 is a prime.

It is a super-2 number, since 2×20098439261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20098439201) 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, 163796 + ... + 258893.

It is an arithmetic number, because the mean of its divisors is an integer number (2661044895).

Almost surely, 2^20098439261 is an apocalyptic number.

It is an amenable number.

20098439261 is a deficient number, since it is larger than the sum of its proper divisors (1189919899).

20098439261 is a wasteful number, since it uses less digits than its factorization.

20098439261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425503.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 20098439261 in words is "twenty billion, ninety-eight million, four hundred thirty-nine thousand, two hundred sixty-one".