20900009071 has 4 divisors (see below), whose sum is σ = 21574202944. Its totient is φ = 20225815200.

The previous prime is 20900009017. The next prime is 20900009111. The reversal of 20900009071 is 17090000902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20900009071 - 2¹⁵ = 20899976303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900000071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337096890 + ... + 337096951.

It is an arithmetic number, because the mean of its divisors is an integer number (5393550736).

Almost surely, 2^20900009071 is an apocalyptic number.

20900009071 is a deficient number, since it is larger than the sum of its proper divisors (674193873).

20900009071 is an equidigital number, since it uses as much as digits as its factorization.

20900009071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674193872.

The product of its (nonzero) digits is 1134, while the sum is 28.

Adding to 20900009071 its reverse (17090000902), we get a palindrome (37990009973).

The spelling of 20900009071 in words is "twenty billion, nine hundred million, nine thousand, seventy-one".