20001215539 has 2 divisors, whose sum is σ = 20001215540. Its totient is φ = 20001215538.

The previous prime is 20001215501. The next prime is 20001215567. The reversal of 20001215539 is 93551210002.

It is an a-pointer prime, because the next prime (20001215567) can be obtained adding 20001215539 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001215539 - 2⁹ = 20001215027 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001213539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000607769 + 10000607770.

It is an arithmetic number, because the mean of its divisors is an integer number (10000607770).

Almost surely, 2^20001215539 is an apocalyptic number.

20001215539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001215539 is an equidigital number, since it uses as much as digits as its factorization.

20001215539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The spelling of 20001215539 in words is "twenty billion, one million, two hundred fifteen thousand, five hundred thirty-nine".