920863566 has 72 divisors (see below), whose sum is σ = 2406975480. Its totient is φ = 263097072.

The previous prime is 920863553. The next prime is 920863571. The reversal of 920863566 is 665368029.

It is a happy number.

920863566 is a `hidden beast` number, since 9 + 2 + 0 + 8 + 635 + 6 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4480 + ... + 43148.

It is an arithmetic number, because the mean of its divisors is an integer number (33430215).

Almost surely, 2^920863566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 920863566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203487740).

920863566 is an abundant number, since it is smaller than the sum of its proper divisors (1486111914).

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

920863566 is a wasteful number, since it uses less digits than its factorization.

920863566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38700 (or 38681 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 920863566 is about 30345.7339011598. The cubic root of 920863566 is about 972.8930407072.

The spelling of 920863566 in words is "nine hundred twenty million, eight hundred sixty-three thousand, five hundred sixty-six".