20551560461 has 8 divisors (see below), whose sum is σ = 21465306240. Its totient is φ = 19639498032.

The previous prime is 20551560437. The next prime is 20551560479. The reversal of 20551560461 is 16406515502.

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 20551560461 - 2¹⁴ = 20551544077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551560061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395846 + ... + 444743.

It is an arithmetic number, because the mean of its divisors is an integer number (2683163280).

Almost surely, 2^20551560461 is an apocalyptic number.

It is an amenable number.

20551560461 is a deficient number, since it is larger than the sum of its proper divisors (913745779).

20551560461 is a wasteful number, since it uses less digits than its factorization.

20551560461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841675.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 20551560461 in words is "twenty billion, five hundred fifty-one million, five hundred sixty thousand, four hundred sixty-one".