20899446 has 8 divisors (see below), whose sum is σ = 41798904. Its totient is φ = 6966480.

The previous prime is 20899441. The next prime is 20899447. The reversal of 20899446 is 64499802.

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

20899446 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20899398 and 20899407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741615 + ... + 1741626.

It is an arithmetic number, because the mean of its divisors is an integer number (5224863).

Almost surely, 2^20899446 is an apocalyptic number.

20899446 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.

20899446 is a wasteful number, since it uses less digits than its factorization.

20899446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483246.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 20899446 is about 4571.5911890719. The cubic root of 20899446 is about 275.4513623470.

The spelling of 20899446 in words is "twenty million, eight hundred ninety-nine thousand, four hundred forty-six".