20993634 has 32 divisors (see below), whose sum is σ = 48161280. Its totient is φ = 6771600.

The previous prime is 20993633. The next prime is 20993663. The reversal of 20993634 is 43639902.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20993633) 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, 4597 + ... + 7944.

It is an arithmetic number, because the mean of its divisors is an integer number (1505040).

Almost surely, 2^20993634 is an apocalyptic number.

20993634 is an abundant number, since it is smaller than the sum of its proper divisors (27167646).

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

20993634 is a wasteful number, since it uses less digits than its factorization.

20993634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12583 (or 12577 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 20993634 is about 4581.8810547634. The cubic root of 20993634 is about 275.8645365487.

The spelling of 20993634 in words is "twenty million, nine hundred ninety-three thousand, six hundred thirty-four".