20009634 has 8 divisors (see below), whose sum is σ = 40019280. Its totient is φ = 6669876.

The previous prime is 20009611. The next prime is 20009651. The reversal of 20009634 is 43690002.

It is a sphenic number, since it is the product of 3 distinct primes.

20009634 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667464 + ... + 1667475.

It is an arithmetic number, because the mean of its divisors is an integer number (5002410).

Almost surely, 2^20009634 is an apocalyptic number.

20009634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20009634 is a wasteful number, since it uses less digits than its factorization.

20009634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334944.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20009634 is about 4473.2129392641. The cubic root of 20009634 is about 271.4853391620.

Adding to 20009634 its reverse (43690002), we get a palindrome (63699636).

The spelling of 20009634 in words is "twenty million, nine thousand, six hundred thirty-four".