20021757715 has 16 divisors (see below), whose sum is σ = 25604149248. Its totient is φ = 14995014496.

The previous prime is 20021757713. The next prime is 20021757773. The reversal of 20021757715 is 51775712002.

It is not a de Polignac number, because 20021757715 - 2¹ = 20021757713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021757713) 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 15 ways as a sum of consecutive naturals, for example, 1846747 + ... + 1857556.

It is an arithmetic number, because the mean of its divisors is an integer number (1600259328).

Almost surely, 2^20021757715 is an apocalyptic number.

20021757715 is a deficient number, since it is larger than the sum of its proper divisors (5582391533).

20021757715 is a wasteful number, since it uses less digits than its factorization.

20021757715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3704378.

The product of its (nonzero) digits is 34300, while the sum is 37.

The spelling of 20021757715 in words is "twenty billion, twenty-one million, seven hundred fifty-seven thousand, seven hundred fifteen".