209920686492 has 48 divisors (see below), whose sum is σ = 565775546112. Its totient is φ = 59870426880.

The previous prime is 209920686491. The next prime is 209920686541. The reversal of 209920686492 is 294686029902.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209920686491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46771528 + ... + 46776015.

It is an arithmetic number, because the mean of its divisors is an integer number (11786990544).

Almost surely, 2^209920686492 is an apocalyptic number.

209920686492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

209920686492 is an abundant number, since it is smaller than the sum of its proper divisors (355854859620).

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

209920686492 is a wasteful number, since it uses less digits than its factorization.

209920686492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93547578 (or 93547576 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 57.

The spelling of 209920686492 in words is "two hundred nine billion, nine hundred twenty million, six hundred eighty-six thousand, four hundred ninety-two".