20011201002 has 48 divisors (see below), whose sum is σ = 46795224840. Its totient is φ = 6143786496.

The previous prime is 20011200997. The next prime is 20011201009. The reversal of 20011201002 is 20010211002.

It can be written as a sum of positive squares in 4 ways, for example, as 17660017881 + 2351183121 = 132891^2 + 48489^2 .

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 (20011201009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13374 + ... + 200502.

Almost surely, 2^20011201002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011201002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23397612420).

20011201002 is an abundant number, since it is smaller than the sum of its proper divisors (26784023838).

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

20011201002 is a wasteful number, since it uses less digits than its factorization.

20011201002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187607 (or 187604 counting only the distinct ones).

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

Adding to 20011201002 its reverse (20010211002), we get a palindrome (40021412004).

The spelling of 20011201002 in words is "twenty billion, eleven million, two hundred one thousand, two".