20201012551 has 4 divisors (see below), whose sum is σ = 20230247704. Its totient is φ = 20171777400.

The previous prime is 20201012521. The next prime is 20201012561. The reversal of 20201012551 is 15521010202.

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 20201012551 - 2¹¹ = 20201010503 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 (20201012521) 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, 14616540 + ... + 14617921.

It is an arithmetic number, because the mean of its divisors is an integer number (5057561926).

Almost surely, 2^20201012551 is an apocalyptic number.

20201012551 is a deficient number, since it is larger than the sum of its proper divisors (29235153).

20201012551 is an equidigital number, since it uses as much as digits as its factorization.

20201012551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29235152.

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 20201012551 its reverse (15521010202), we get a palindrome (35722022753).

The spelling of 20201012551 in words is "twenty billion, two hundred one million, twelve thousand, five hundred fifty-one".