20021016746669 has 4 divisors (see below), whose sum is σ = 20021469253500. Its totient is φ = 20020564239840.

The previous prime is 20021016746659. The next prime is 20021016746711. The reversal of 20021016746669 is 96664761012002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7020449049769 + 13000567696900 = 2649613^2 + 3605630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021016746669 is a prime.

It is a super-2 number, since 2×20021016746669² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021016746639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226187042 + ... + 226275539.

It is an arithmetic number, because the mean of its divisors is an integer number (5005367313375).

Almost surely, 2^{20021016746669} is an apocalyptic number.

It is an amenable number.

20021016746669 is a deficient number, since it is larger than the sum of its proper divisors (452506831).

20021016746669 is an equidigital number, since it uses as much as digits as its factorization.

20021016746669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452506830.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 20021016746669 in words is "twenty trillion, twenty-one billion, sixteen million, seven hundred forty-six thousand, six hundred sixty-nine".