20512023989 has 2 divisors, whose sum is σ = 20512023990. Its totient is φ = 20512023988.

The previous prime is 20512023929. The next prime is 20512024031. The reversal of 20512023989 is 98932021502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13818002500 + 6694021489 = 117550^2 + 81817^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512023989 - 2¹² = 20512019893 is a prime.

It is a super-2 number, since 2×20512023989² (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 (20512023929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256011994 + 10256011995.

It is an arithmetic number, because the mean of its divisors is an integer number (10256011995).

Almost surely, 2^20512023989 is an apocalyptic number.

It is an amenable number.

20512023989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512023989 is an equidigital number, since it uses as much as digits as its factorization.

20512023989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 20512023989 in words is "twenty billion, five hundred twelve million, twenty-three thousand, nine hundred eighty-nine".