20812002102 has 48 divisors (see below), whose sum is σ = 45273310992. Its totient is φ = 6909603840.

The previous prime is 20812002067. The next prime is 20812002103. The reversal of 20812002102 is 20120021802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20812002103) 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, 5270893 + ... + 5274839.

It is an arithmetic number, because the mean of its divisors is an integer number (943193979).

Almost surely, 2^20812002102 is an apocalyptic number.

20812002102 is an abundant number, since it is smaller than the sum of its proper divisors (24461308890).

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

20812002102 is a wasteful number, since it uses less digits than its factorization.

20812002102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5053 (or 5050 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20812002102 its reverse (20120021802), we get a palindrome (40932023904).

The spelling of 20812002102 in words is "twenty billion, eight hundred twelve million, two thousand, one hundred two".