99920731 has 8 divisors (see below), whose sum is σ = 104537664. Its totient is φ = 95407680.

The previous prime is 99920693. The next prime is 99920761. The reversal of 99920731 is 13702999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99920731 - 2⁷ = 99920603 is a prime.

It is a super-2 number, since 2×99920731² = 19968304967148722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99920761) 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 7 ways as a sum of consecutive naturals, for example, 24000 + ... + 27853.

It is an arithmetic number, because the mean of its divisors is an integer number (13067208).

Almost surely, 2^99920731 is an apocalyptic number.

99920731 is a deficient number, since it is larger than the sum of its proper divisors (4616933).

99920731 is a wasteful number, since it uses less digits than its factorization.

99920731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51941.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 99920731 is about 9996.0357642417. The cubic root of 99920731 is about 464.0362062388.

The spelling of 99920731 in words is "ninety-nine million, nine hundred twenty thousand, seven hundred thirty-one".