20011002 has 32 divisors (see below), whose sum is σ = 44596224. Its totient is φ = 5934000.

The previous prime is 20011001. The next prime is 20011007.

It is a happy number.

20011002 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is not an unprimeable number, because it can be changed into a prime (20011001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124 + ... + 6327.

It is an arithmetic number, because the mean of its divisors is an integer number (1393632).

Almost surely, 2^20011002 is an apocalyptic number.

20011002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22298112).

20011002 is an abundant number, since it is smaller than the sum of its proper divisors (24585222).

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

20011002 is a wasteful number, since it uses less digits than its factorization.

20011002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6514.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 20011002 is about 4473.3658468764. The cubic root of 20011002 is about 271.4915259065.

It can be divided in two parts, 2001 and 1002, that multiplied together give a palindrome (2005002).

The spelling of 20011002 in words is "twenty million, eleven thousand, two".