20101002 has 16 divisors (see below), whose sum is σ = 41588640. Its totient is φ = 6469232.

The previous prime is 20101001. The next prime is 20101009. The reversal of 20101002 is 20010102.

It is a happy number.

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 (20101001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57588 + ... + 57935.

It is an arithmetic number, because the mean of its divisors is an integer number (2599290).

Almost surely, 2^20101002 is an apocalyptic number.

20101002 is an abundant number, since it is smaller than the sum of its proper divisors (21487638).

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

20101002 is a wasteful number, since it uses less digits than its factorization.

20101002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115557.

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

The square root of 20101002 is about 4483.4141008834. The cubic root of 20101002 is about 271.8979306330.

Adding to 20101002 its reverse (20010102), we get a palindrome (40111104).

It can be divided in two parts, 2010100 and 2, that added together give a palindrome (2010102).

The spelling of 20101002 in words is "twenty million, one hundred one thousand, two".