20128236498 has 24 divisors (see below), whose sum is σ = 43714785036. Its totient is φ = 6693472800.

The previous prime is 20128236493. The next prime is 20128236503. The reversal of 20128236498 is 89463282102.

20128236498 is a `hidden beast` number, since 2 + 0 + 1 + 282 + 364 + 9 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (20128236493) and next prime (20128236503).

It can be written as a sum of positive squares in 2 ways, for example, as 20127948129 + 288369 = 141873^2 + 537^2 .

It is not an unprimeable number, because it can be changed into a prime (20128236493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1320493 + ... + 1335648.

Almost surely, 2^20128236498 is an apocalyptic number.

20128236498 is an abundant number, since it is smaller than the sum of its proper divisors (23586548538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20128236498 is a wasteful number, since it uses less digits than its factorization.

20128236498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656570 (or 2656567 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 20128236498 in words is "twenty billion, one hundred twenty-eight million, two hundred thirty-six thousand, four hundred ninety-eight".