20993567461 has 8 divisors (see below), whose sum is σ = 22317047424. Its totient is φ = 19679928000.

The previous prime is 20993567459. The next prime is 20993567467. The reversal of 20993567461 is 16476539902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20993567461 - 2¹ = 20993567459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20993567399 and 20993567408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993567467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2455725 + ... + 2464258.

It is an arithmetic number, because the mean of its divisors is an integer number (2789630928).

Almost surely, 2^20993567461 is an apocalyptic number.

It is an amenable number.

20993567461 is a deficient number, since it is larger than the sum of its proper divisors (1323479963).

20993567461 is a wasteful number, since it uses less digits than its factorization.

20993567461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4920251.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 20993567461 in words is "twenty billion, nine hundred ninety-three million, five hundred sixty-seven thousand, four hundred sixty-one".