20036551 has 4 divisors (see below), whose sum is σ = 20335672. Its totient is φ = 19737432.

The previous prime is 20036531. The next prime is 20036561. The reversal of 20036551 is 15563002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20036551 - 2¹¹ = 20034503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20036521) 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, 149460 + ... + 149593.

It is an arithmetic number, because the mean of its divisors is an integer number (5083918).

Almost surely, 2^20036551 is an apocalyptic number.

20036551 is a deficient number, since it is larger than the sum of its proper divisors (299121).

20036551 is an equidigital number, since it uses as much as digits as its factorization.

20036551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299120.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20036551 is about 4476.2206156533. The cubic root of 20036551 is about 271.6070188256.

Adding to 20036551 its reverse (15563002), we get a palindrome (35599553).

The spelling of 20036551 in words is "twenty million, thirty-six thousand, five hundred fifty-one".