20685974398 has 24 divisors (see below), whose sum is σ = 32274354528. Its totient is φ = 9943284288.

The previous prime is 20685974389. The next prime is 20685974399. The reversal of 20685974398 is 89347958602.

It is a super-2 number, since 2×20685974398² (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 (20685974399) 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, 365515 + ... + 418297.

It is an arithmetic number, because the mean of its divisors is an integer number (1344764772).

Almost surely, 2^20685974398 is an apocalyptic number.

20685974398 is a deficient number, since it is larger than the sum of its proper divisors (11588380130).

20685974398 is a wasteful number, since it uses less digits than its factorization.

20685974398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53076 (or 53047 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 20685974398 in words is "twenty billion, six hundred eighty-five million, nine hundred seventy-four thousand, three hundred ninety-eight".