20313221989 has 2 divisors, whose sum is σ = 20313221990. Its totient is φ = 20313221988.

The previous prime is 20313221983. The next prime is 20313222023. The reversal of 20313221989 is 98912231302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14978088225 + 5335133764 = 122385^2 + 73042^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313221989 - 2¹⁹ = 20312697701 is a prime.

It is a super-2 number, since 2×20313221989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20313221983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156610994 + 10156610995.

It is an arithmetic number, because the mean of its divisors is an integer number (10156610995).

Almost surely, 2^20313221989 is an apocalyptic number.

It is an amenable number.

20313221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313221989 is an equidigital number, since it uses as much as digits as its factorization.

20313221989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 20313221989 in words is "twenty billion, three hundred thirteen million, two hundred twenty-one thousand, nine hundred eighty-nine".