20545899 has 8 divisors (see below), whose sum is σ = 29884992. Its totient is φ = 12452040.

The previous prime is 20545883. The next prime is 20545907. The reversal of 20545899 is 99854502.

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

It is not a de Polignac number, because 20545899 - 2⁴ = 20545883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20545899.

It is not an unprimeable number, because it can be changed into a prime (20545829) 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, 311269 + ... + 311334.

It is an arithmetic number, because the mean of its divisors is an integer number (3735624).

Almost surely, 2^20545899 is an apocalyptic number.

20545899 is a deficient number, since it is larger than the sum of its proper divisors (9339093).

20545899 is a wasteful number, since it uses less digits than its factorization.

20545899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622617.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 20545899 is about 4532.7584316837. The cubic root of 20545899 is about 273.8892896366.

The spelling of 20545899 in words is "twenty million, five hundred forty-five thousand, eight hundred ninety-nine".