33890220 has 144 divisors (see below), whose sum is σ = 126584640. Its totient is φ = 7147008.

The previous prime is 33890203. The next prime is 33890237. The reversal of 33890220 is 2209833.

It is an interprime number because it is at equal distance from previous prime (33890203) and next prime (33890237).

It is a super-2 number, since 2×33890220² = 2297094023296800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15346 + ... + 17414.

It is an arithmetic number, because the mean of its divisors is an integer number (879060).

Almost surely, 2^33890220 is an apocalyptic number.

33890220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33890220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63292320).

33890220 is an abundant number, since it is smaller than the sum of its proper divisors (92694420).

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

33890220 is a wasteful number, since it uses less digits than its factorization.

33890220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104 (or 2099 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 33890220 is about 5821.5307265358. The cubic root of 33890220 is about 323.6121330269.

The spelling of 33890220 in words is "thirty-three million, eight hundred ninety thousand, two hundred twenty".