20634889 has 12 divisors (see below), whose sum is σ = 23916528. Its totient is φ = 17652800.

The previous prime is 20634881. The next prime is 20634949. The reversal of 20634889 is 98843602.

It is not a de Polignac number, because 20634889 - 2³ = 20634881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20634881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67 + ... + 6424.

It is an arithmetic number, because the mean of its divisors is an integer number (1993044).

Almost surely, 2^20634889 is an apocalyptic number.

It is an amenable number.

20634889 is a deficient number, since it is larger than the sum of its proper divisors (3281639).

20634889 is a wasteful number, since it uses less digits than its factorization.

20634889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536 (or 6519 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 20634889 is about 4542.5641437408. The cubic root of 20634889 is about 274.2841503171.

The spelling of 20634889 in words is "twenty million, six hundred thirty-four thousand, eight hundred eighty-nine".