20453436 has 18 divisors (see below), whose sum is σ = 51701832. Its totient is φ = 6817800.

The previous prime is 20453401. The next prime is 20453437. The reversal of 20453436 is 63435402.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284040 + ... + 284111.

It is an arithmetic number, because the mean of its divisors is an integer number (2872324).

Almost surely, 2^20453436 is an apocalyptic number.

It is an amenable number.

20453436 is an abundant number, since it is smaller than the sum of its proper divisors (31248396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20453436 is a wasteful number, since it uses less digits than its factorization.

20453436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568161 (or 568156 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 20453436 is about 4522.5475121882. The cubic root of 20453436 is about 273.4778091388.

Adding to 20453436 its reverse (63435402), we get a palindrome (83888838).

The spelling of 20453436 in words is "twenty million, four hundred fifty-three thousand, four hundred thirty-six".