20436398 has 4 divisors (see below), whose sum is σ = 30654600. Its totient is φ = 10218198.

The previous prime is 20436391. The next prime is 20436401. The reversal of 20436398 is 89363402.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20436391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109098 + ... + 5109101.

It is an arithmetic number, because the mean of its divisors is an integer number (7663650).

Almost surely, 2^20436398 is an apocalyptic number.

20436398 is a deficient number, since it is larger than the sum of its proper divisors (10218202).

20436398 is a wasteful number, since it uses less digits than its factorization.

20436398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10218201.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20436398 is about 4520.6634468848. The cubic root of 20436398 is about 273.4018510891.

The spelling of 20436398 in words is "twenty million, four hundred thirty-six thousand, three hundred ninety-eight".