20220566477 has 4 divisors (see below), whose sum is σ = 20917827420. Its totient is φ = 19523305536.

The previous prime is 20220566467. The next prime is 20220566503. The reversal of 20220566477 is 77466502202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77466502202 = 2 ⋅38733251101.

It can be written as a sum of positive squares in 2 ways, for example, as 12802017316 + 7418549161 = 113146^2 + 86131^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220566477 - 2⁴ = 20220566461 is a prime.

It is a super-3 number, since 3×20220566477³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220566407) 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, 348630428 + ... + 348630485.

It is an arithmetic number, because the mean of its divisors is an integer number (5229456855).

Almost surely, 2^20220566477 is an apocalyptic number.

It is an amenable number.

20220566477 is a deficient number, since it is larger than the sum of its proper divisors (697260943).

20220566477 is an equidigital number, since it uses as much as digits as its factorization.

20220566477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697260942.

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 20220566477 in words is "twenty billion, two hundred twenty million, five hundred sixty-six thousand, four hundred seventy-seven".