20745330 has 32 divisors (see below), whose sum is σ = 50851584. Its totient is φ = 5414016.

The previous prime is 20745301. The next prime is 20745341. The reversal of 20745330 is 3354702.

It is a self number, because there is not a number n which added to its sum of digits gives 20745330.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5947 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (1589112).

Almost surely, 2^20745330 is an apocalyptic number.

20745330 is an abundant number, since it is smaller than the sum of its proper divisors (30106254).

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

20745330 is a wasteful number, since it uses less digits than its factorization.

20745330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14770.

The product of its (nonzero) digits is 2520, while the sum is 24.

The square root of 20745330 is about 4554.7041616333. The cubic root of 20745330 is about 274.7726164476.

The spelling of 20745330 in words is "twenty million, seven hundred forty-five thousand, three hundred thirty".