20365820389 has 2 divisors, whose sum is σ = 20365820390. Its totient is φ = 20365820388.

The previous prime is 20365820341. The next prime is 20365820441. The reversal of 20365820389 is 98302856302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11351837025 + 9013983364 = 106545^2 + 94942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20365820389 is a prime.

It is a super-2 number, since 2×20365820389² (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 (20365820989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182910194 + 10182910195.

It is an arithmetic number, because the mean of its divisors is an integer number (10182910195).

Almost surely, 2^20365820389 is an apocalyptic number.

It is an amenable number.

20365820389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20365820389 is an equidigital number, since it uses as much as digits as its factorization.

20365820389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 20365820389 in words is "twenty billion, three hundred sixty-five million, eight hundred twenty thousand, three hundred eighty-nine".