20332290 has 32 divisors (see below), whose sum is σ = 53234496. Its totient is φ = 4928960.

The previous prime is 20332283. The next prime is 20332297. The reversal of 20332290 is 9223302.

It is an interprime number because it is at equal distance from previous prime (20332283) and next prime (20332297).

It is not an unprimeable number, because it can be changed into a prime (20332297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30477 + ... + 31136.

It is an arithmetic number, because the mean of its divisors is an integer number (1663578).

Almost surely, 2^20332290 is an apocalyptic number.

20332290 is an abundant number, since it is smaller than the sum of its proper divisors (32902206).

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

20332290 is a wasteful number, since it uses less digits than its factorization.

20332290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61634.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20332290 is about 4509.1340632099. The cubic root of 20332290 is about 272.9368019123.

Adding to 20332290 its reverse (9223302), we get a palindrome (29555592).

The spelling of 20332290 in words is "twenty million, three hundred thirty-two thousand, two hundred ninety".