920884813 has 4 divisors (see below), whose sum is σ = 925249408. Its totient is φ = 916520220.

The previous prime is 920884807. The next prime is 920884843. The reversal of 920884813 is 318488029.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920884813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 920884813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920884843) 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 3 ways as a sum of consecutive naturals, for example, 2181981 + ... + 2182402.

It is an arithmetic number, because the mean of its divisors is an integer number (231312352).

Almost surely, 2^920884813 is an apocalyptic number.

It is an amenable number.

920884813 is a deficient number, since it is larger than the sum of its proper divisors (4364595).

920884813 is a wasteful number, since it uses less digits than its factorization.

920884813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364594.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 920884813 is about 30346.0839812981. The cubic root of 920884813 is about 972.9005231401.

The spelling of 920884813 in words is "nine hundred twenty million, eight hundred eighty-four thousand, eight hundred thirteen".