20899445 has 8 divisors (see below), whose sum is σ = 28662144. Its totient is φ = 14331024.

The previous prime is 20899441. The next prime is 20899447. The reversal of 20899445 is 54499802.

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

It is a cyclic number.

It is not a de Polignac number, because 20899445 - 2² = 20899441 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 298529 + ... + 298598.

It is an arithmetic number, because the mean of its divisors is an integer number (3582768).

Almost surely, 2^20899445 is an apocalyptic number.

It is an amenable number.

20899445 is a deficient number, since it is larger than the sum of its proper divisors (7762699).

20899445 is an equidigital number, since it uses as much as digits as its factorization.

20899445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597139.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 20899445 is about 4571.5910797008. The cubic root of 20899445 is about 275.4513579537.

The spelling of 20899445 in words is "twenty million, eight hundred ninety-nine thousand, four hundred forty-five".