20206011633551 has 4 divisors (see below), whose sum is σ = 21084533878512. Its totient is φ = 19327489388592.

The previous prime is 20206011633539. The next prime is 20206011633581. The reversal of 20206011633551 is 15533611060202.

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 20206011633551 - 2¹⁴ = 20206011617167 is a prime.

It is a super-2 number, since 2×20206011633551² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20206011633581) 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, 439261122446 + ... + 439261122491.

It is an arithmetic number, because the mean of its divisors is an integer number (5271133469628).

Almost surely, 2^{20206011633551} is an apocalyptic number.

20206011633551 is a deficient number, since it is larger than the sum of its proper divisors (878522244961).

20206011633551 is an equidigital number, since it uses as much as digits as its factorization.

20206011633551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878522244960.

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 20206011633551 its reverse (15533611060202), we get a palindrome (35739622693753).

The spelling of 20206011633551 in words is "twenty trillion, two hundred six billion, eleven million, six hundred thirty-three thousand, five hundred fifty-one".