20398899 has 16 divisors (see below), whose sum is σ = 28734464. Its totient is φ = 12852000.

The previous prime is 20398897. The next prime is 20398909. The reversal of 20398899 is 99889302.

It is not a de Polignac number, because 20398899 - 2¹ = 20398897 is a prime.

It is a super-2 number, since 2×20398899² = 832230160824402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20398891) 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 15 ways as a sum of consecutive naturals, for example, 1449 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (1795904).

Almost surely, 2^20398899 is an apocalyptic number.

20398899 is a deficient number, since it is larger than the sum of its proper divisors (8335565).

20398899 is a wasteful number, since it uses less digits than its factorization.

20398899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5178.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 20398899 is about 4516.5140318613. The cubic root of 20398899 is about 273.2345258899.

The spelling of 20398899 in words is "twenty million, three hundred ninety-eight thousand, eight hundred ninety-nine".