20838899 has 4 divisors (see below), whose sum is σ = 20856264. Its totient is φ = 20821536.

The previous prime is 20838871. The next prime is 20838919. The reversal of 20838899 is 99883802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20838899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20838869) 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, 6737 + ... + 9330.

It is an arithmetic number, because the mean of its divisors is an integer number (5214066).

Almost surely, 2^20838899 is an apocalyptic number.

20838899 is a deficient number, since it is larger than the sum of its proper divisors (17365).

20838899 is a wasteful number, since it uses less digits than its factorization.

20838899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17364.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 20838899 is about 4564.9642933981. The cubic root of 20838899 is about 275.1851051281.

The spelling of 20838899 in words is "twenty million, eight hundred thirty-eight thousand, eight hundred ninety-nine".