20201012556 has 48 divisors (see below), whose sum is σ = 47404183680. Its totient is φ = 6695377920.

The previous prime is 20201012521. The next prime is 20201012561. The reversal of 20201012556 is 65521010202.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3184620 + ... + 3190956.

It is an arithmetic number, because the mean of its divisors is an integer number (987587160).

Almost surely, 2^20201012556 is an apocalyptic number.

It is an amenable number.

20201012556 is an abundant number, since it is smaller than the sum of its proper divisors (27203171124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20201012556 is a wasteful number, since it uses less digits than its factorization.

20201012556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7814 (or 7812 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 20201012556 its reverse (65521010202), we get a palindrome (85722022758).

The spelling of 20201012556 in words is "twenty billion, two hundred one million, twelve thousand, five hundred fifty-six".