20126836989 has 20 divisors (see below), whose sum is σ = 34361161824. Its totient is φ = 11501049384.

The previous prime is 20126836957. The next prime is 20126836991. The reversal of 20126836989 is 98963862102.

It is not a de Polignac number, because 20126836989 - 2⁵ = 20126836957 is a prime.

It is a super-2 number, since 2×20126836989² (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 (20126836909) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17747967 + ... + 17749100.

Almost surely, 2^20126836989 is an apocalyptic number.

It is an amenable number.

20126836989 is a deficient number, since it is larger than the sum of its proper divisors (14234324835).

20126836989 is an equidigital number, since it uses as much as digits as its factorization.

20126836989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35497086 (or 35497077 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 20126836989 in words is "twenty billion, one hundred twenty-six million, eight hundred thirty-six thousand, nine hundred eighty-nine".