20000081990 has 32 divisors (see below), whose sum is σ = 41389415424. Its totient is φ = 6816106080.

The previous prime is 20000081977. The next prime is 20000081999. The reversal of 20000081990 is 9918000002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000081999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843746 + ... + 867125.

It is an arithmetic number, because the mean of its divisors is an integer number (1293419232).

Almost surely, 2^20000081990 is an apocalyptic number.

20000081990 is an abundant number, since it is smaller than the sum of its proper divisors (21389333434).

20000081990 is a wasteful number, since it uses less digits than its factorization.

20000081990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711052.

The product of its (nonzero) digits is 1296, while the sum is 29.

Adding to 20000081990 its reverse (9918000002), we get a palindrome (29918081992).

The spelling of 20000081990 in words is "twenty billion, eighty-one thousand, nine hundred ninety".