20120120001 has 12 divisors (see below), whose sum is σ = 29066007828. Its totient is φ = 13411746144.

The previous prime is 20120119993. The next prime is 20120120011. The reversal of 20120120001 is 10002102102.

It can be written as a sum of positive squares in 2 ways, for example, as 7323080625 + 12797039376 = 85575^2 + 113124^2 .

It is not a de Polignac number, because 20120120001 - 2³ = 20120119993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20120120011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60150 + ... + 209423.

It is an arithmetic number, because the mean of its divisors is an integer number (2422167319).

Almost surely, 2^20120120001 is an apocalyptic number.

It is an amenable number.

20120120001 is a deficient number, since it is larger than the sum of its proper divisors (8945887827).

20120120001 is a wasteful number, since it uses less digits than its factorization.

20120120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277872 (or 277869 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20120120001 its reverse (10002102102), we get a palindrome (30122222103).

The spelling of 20120120001 in words is "twenty billion, one hundred twenty million, one hundred twenty thousand, one".