20582056781 has 32 divisors (see below), whose sum is σ = 24554893440. Its totient is φ = 17006112000.

The previous prime is 20582056739. The next prime is 20582056799. The reversal of 20582056781 is 18765028502.

It is a cyclic number.

It is not a de Polignac number, because 20582056781 - 2¹⁰ = 20582055757 is a prime.

It is a super-2 number, since 2×20582056781² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20582056181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2536631 + ... + 2544731.

It is an arithmetic number, because the mean of its divisors is an integer number (767340420).

Almost surely, 2^20582056781 is an apocalyptic number.

It is an amenable number.

20582056781 is a deficient number, since it is larger than the sum of its proper divisors (3972836659).

20582056781 is a wasteful number, since it uses less digits than its factorization.

20582056781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8397.

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 20582056781 in words is "twenty billion, five hundred eighty-two million, fifty-six thousand, seven hundred eighty-one".