20977240548566 has 8 divisors (see below), whose sum is σ = 32480888591424. Its totient is φ = 10150277684760.

The previous prime is 20977240548557. The next prime is 20977240548569. The reversal of 20977240548566 is 66584504277902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×20977240548566⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977240548569) 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, 169171294685 + ... + 169171294808.

It is an arithmetic number, because the mean of its divisors is an integer number (4060111073928).

Almost surely, 2^{20977240548566} is an apocalyptic number.

20977240548566 is a deficient number, since it is larger than the sum of its proper divisors (11503648042858).

20977240548566 is a wasteful number, since it uses less digits than its factorization.

20977240548566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338342589526.

The product of its (nonzero) digits is 203212800, while the sum is 65.

The spelling of 20977240548566 in words is "twenty trillion, nine hundred seventy-seven billion, two hundred forty million, five hundred forty-eight thousand, five hundred sixty-six".