20499600366 has 80 divisors (see below), whose sum is σ = 52811168256. Its totient is φ = 5821902864.

The previous prime is 20499600343. The next prime is 20499600367. The reversal of 20499600366 is 66300699402.

20499600366 is a `hidden beast` number, since 2 + 0 + 4 + 9 + 9 + 600 + 36 + 6 = 666.

It is a super-5 number, since 5×20499600366⁵ (a number of 53 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499600367) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 135255 + ... + 243501.

Almost surely, 2^20499600366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20499600366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26405584128).

20499600366 is an abundant number, since it is smaller than the sum of its proper divisors (32311567890).

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

20499600366 is a wasteful number, since it uses less digits than its factorization.

20499600366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108435 (or 108426 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 20499600366 in words is "twenty billion, four hundred ninety-nine million, six hundred thousand, three hundred sixty-six".