920427731999 has 4 divisors (see below), whose sum is σ = 941833028136. Its totient is φ = 899022435864.

The previous prime is 920427731987. The next prime is 920427732023. The reversal of 920427731999 is 999137724029.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 920427731999 - 2²⁴ = 920410954783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920427731969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10702648004 + ... + 10702648089.

It is an arithmetic number, because the mean of its divisors is an integer number (235458257034).

Almost surely, 2^920427731999 is an apocalyptic number.

920427731999 is a deficient number, since it is larger than the sum of its proper divisors (21405296137).

920427731999 is a wasteful number, since it uses less digits than its factorization.

920427731999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21405296136.

The product of its (nonzero) digits is 15431472, while the sum is 62.

The spelling of 920427731999 in words is "nine hundred twenty billion, four hundred twenty-seven million, seven hundred thirty-one thousand, nine hundred ninety-nine".