920781947 has 8 divisors (see below), whose sum is σ = 931814544. Its totient is φ = 909815328.

The previous prime is 920781943. The next prime is 920781949. The reversal of 920781947 is 749187029.

920781947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 920781947 - 2² = 920781943 is a prime.

It is a super-2 number, since 2×920781947² = 1695678787842221618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920781943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11873 + ... + 44525.

It is an arithmetic number, because the mean of its divisors is an integer number (116476818).

Almost surely, 2^920781947 is an apocalyptic number.

920781947 is a deficient number, since it is larger than the sum of its proper divisors (11032597).

920781947 is a wasteful number, since it uses less digits than its factorization.

920781947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32989.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 920781947 is about 30344.3890530029. The cubic root of 920781947 is about 972.8642963466.

The spelling of 920781947 in words is "nine hundred twenty million, seven hundred eighty-one thousand, nine hundred forty-seven".