30920886 has 16 divisors (see below), whose sum is σ = 68713200. Its totient is φ = 10306944.

The previous prime is 30920881. The next prime is 30920891. The reversal of 30920886 is 68802903.

It is an interprime number because it is at equal distance from previous prime (30920881) and next prime (30920891).

It is a super-2 number, since 2×30920886² = 1912202382049992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30920886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30920881) 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, 286251 + ... + 286358.

It is an arithmetic number, because the mean of its divisors is an integer number (4294575).

Almost surely, 2^30920886 is an apocalyptic number.

30920886 is an abundant number, since it is smaller than the sum of its proper divisors (37792314).

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

30920886 is a wasteful number, since it uses less digits than its factorization.

30920886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572620 (or 572614 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 30920886 is about 5560.6551772251. The cubic root of 30920886 is about 313.8706040474.

The spelling of 30920886 in words is "thirty million, nine hundred twenty thousand, eight hundred eighty-six".