20036451 has 4 divisors (see below), whose sum is σ = 26715272. Its totient is φ = 13357632.

The previous prime is 20036389. The next prime is 20036461. The reversal of 20036451 is 15463002.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-20036451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20036461) 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, 3339406 + ... + 3339411.

It is an arithmetic number, because the mean of its divisors is an integer number (6678818).

Almost surely, 2^20036451 is an apocalyptic number.

20036451 is a deficient number, since it is larger than the sum of its proper divisors (6678821).

20036451 is an equidigital number, since it uses as much as digits as its factorization.

20036451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6678820.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20036451 is about 4476.2094455019. The cubic root of 20036451 is about 271.6065669723.

Adding to 20036451 its reverse (15463002), we get a palindrome (35499453).

The spelling of 20036451 in words is "twenty million, thirty-six thousand, four hundred fifty-one".