30220857 has 20 divisors (see below), whose sum is σ = 45295140. Its totient is φ = 20080224.

The previous prime is 30220847. The next prime is 30220867. The reversal of 30220857 is 75802203.

It is an interprime number because it is at equal distance from previous prime (30220847) and next prime (30220867).

It can be written as a sum of positive squares in 2 ways, for example, as 27625536 + 2595321 = 5256^2 + 1611^2 .

It is not a de Polignac number, because 30220857 - 2¹⁸ = 29958713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 30220857.

It is not an unprimeable number, because it can be changed into a prime (30220807) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40863 + ... + 41595.

It is an arithmetic number, because the mean of its divisors is an integer number (2264757).

Almost surely, 2^30220857 is an apocalyptic number.

It is an amenable number.

30220857 is a deficient number, since it is larger than the sum of its proper divisors (15074283).

30220857 is an equidigital number, since it uses as much as digits as its factorization.

30220857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 30220857 is about 5497.3499979536. The cubic root of 30220857 is about 311.4838915499.

The spelling of 30220857 in words is "thirty million, two hundred twenty thousand, eight hundred fifty-seven".