20212898517 has 30 divisors (see below), whose sum is σ = 35124310518. Its totient is φ = 11550225456.

The previous prime is 20212898507. The next prime is 20212898521. The reversal of 20212898517 is 71589821202.

20212898517 is a `hidden beast` number, since 2 + 0 + 2 + 128 + 9 + 8 + 517 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13118037156 + 7094861361 = 114534^2 + 84231^2 .

It is not a de Polignac number, because 20212898517 - 2⁸ = 20212898261 is a prime.

It is a super-2 number, since 2×20212898517² (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 (20212898507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2542378 + ... + 2550315.

Almost surely, 2^20212898517 is an apocalyptic number.

20212898517 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20212898517 is a deficient number, since it is larger than the sum of its proper divisors (14911412001).

20212898517 is an equidigital number, since it uses as much as digits as its factorization.

20212898517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092719 (or 5092703 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 20212898517 in words is "twenty billion, two hundred twelve million, eight hundred ninety-eight thousand, five hundred seventeen".