20398829 has 4 divisors (see below), whose sum is σ = 22253280. Its totient is φ = 18544380.

The previous prime is 20398823. The next prime is 20398831. The reversal of 20398829 is 92889302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20398829 - 2¹⁶ = 20333293 is a prime.

It is a super-2 number, since 2×20398829² = 832224449142482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20398823) 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, 927209 + ... + 927230.

It is an arithmetic number, because the mean of its divisors is an integer number (5563320).

Almost surely, 2^20398829 is an apocalyptic number.

It is an amenable number.

20398829 is a deficient number, since it is larger than the sum of its proper divisors (1854451).

20398829 is a wasteful number, since it uses less digits than its factorization.

20398829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854450.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 20398829 is about 4516.5062825153. The cubic root of 20398829 is about 273.2342133495.

The spelling of 20398829 in words is "twenty million, three hundred ninety-eight thousand, eight hundred twenty-nine".