20136455 has 4 divisors (see below), whose sum is σ = 24163752. Its totient is φ = 16109160.

The previous prime is 20136443. The next prime is 20136463. The reversal of 20136455 is 55463102.

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

It is not a de Polignac number, because 20136455 - 2⁴ = 20136439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2013641 + ... + 2013650.

It is an arithmetic number, because the mean of its divisors is an integer number (6040938).

Almost surely, 2^20136455 is an apocalyptic number.

20136455 is a deficient number, since it is larger than the sum of its proper divisors (4027297).

20136455 is an equidigital number, since it uses as much as digits as its factorization.

20136455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027296.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20136455 is about 4487.3661539928. The cubic root of 20136455 is about 272.0576894288.

Adding to 20136455 its reverse (55463102), we get a palindrome (75599557).

The spelling of 20136455 in words is "twenty million, one hundred thirty-six thousand, four hundred fifty-five".