20581081002 has 48 divisors (see below), whose sum is σ = 44927955072. Its totient is φ = 6808855200.

The previous prime is 20581080983. The next prime is 20581081019. The reversal of 20581081002 is 20018018502.

20581081002 is a `hidden beast` number, since 2 + 0 + 581 + 0 + 81 + 0 + 0 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2102323 + ... + 2112089.

It is an arithmetic number, because the mean of its divisors is an integer number (935999064).

Almost surely, 2^20581081002 is an apocalyptic number.

20581081002 is an abundant number, since it is smaller than the sum of its proper divisors (24346874070).

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

20581081002 is a wasteful number, since it uses less digits than its factorization.

20581081002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643 (or 10640 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

Adding to 20581081002 its reverse (20018018502), we get a palindrome (40599099504).

The spelling of 20581081002 in words is "twenty billion, five hundred eighty-one million, eighty-one thousand, two".