20716217450 has 24 divisors (see below), whose sum is σ = 38682119052. Its totient is φ = 8254238720.

The previous prime is 20716217447. The next prime is 20716217491. The reversal of 20716217450 is 5471261702.

It can be written as a sum of positive squares in 6 ways, for example, as 16925229409 + 3790988041 = 130097^2 + 61571^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20716217450.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793229 + ... + 818928.

Almost surely, 2^20716217450 is an apocalyptic number.

20716217450 is a deficient number, since it is larger than the sum of its proper divisors (17965901602).

20716217450 is a wasteful number, since it uses less digits than its factorization.

20716217450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612426 (or 1612421 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 20716217450 in words is "twenty billion, seven hundred sixteen million, two hundred seventeen thousand, four hundred fifty".