20505700039 has 8 divisors (see below), whose sum is σ = 22409038080. Its totient is φ = 18608892600.

The previous prime is 20505700031. The next prime is 20505700063. The reversal of 20505700039 is 93000750502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20505700039 - 2³ = 20505700031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505700031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1626079 + ... + 1638640.

It is an arithmetic number, because the mean of its divisors is an integer number (2801129760).

Almost surely, 2^20505700039 is an apocalyptic number.

20505700039 is a deficient number, since it is larger than the sum of its proper divisors (1903338041).

20505700039 is a wasteful number, since it uses less digits than its factorization.

20505700039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3265301.

The product of its (nonzero) digits is 9450, while the sum is 31.

The spelling of 20505700039 in words is "twenty billion, five hundred five million, seven hundred thousand, thirty-nine".