20021775673 has 4 divisors (see below), whose sum is σ = 21075553360. Its totient is φ = 18967997988.

The previous prime is 20021775667. The next prime is 20021775677. The reversal of 20021775673 is 37657712002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37657712002 = 2 ⋅18828856001.

It is a cyclic number.

It is not a de Polignac number, because 20021775673 - 2³³ = 11431841081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021775677) 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, 526888815 + ... + 526888852.

It is an arithmetic number, because the mean of its divisors is an integer number (5268888340).

Almost surely, 2^20021775673 is an apocalyptic number.

It is an amenable number.

20021775673 is a deficient number, since it is larger than the sum of its proper divisors (1053777687).

20021775673 is a wasteful number, since it uses less digits than its factorization.

20021775673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053777686.

The product of its (nonzero) digits is 123480, while the sum is 40.

The spelling of 20021775673 in words is "twenty billion, twenty-one million, seven hundred seventy-five thousand, six hundred seventy-three".