20580236477 has 4 divisors (see below), whose sum is σ = 20580525120. Its totient is φ = 20579947836.

The previous prime is 20580236473. The next prime is 20580236489. The reversal of 20580236477 is 77463208502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20580236477 - 2² = 20580236473 is a prime.

It is a super-2 number, since 2×20580236477² (a number of 21 digits) contains 22 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 (20580236473) 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, 48524 + ... + 208602.

It is an arithmetic number, because the mean of its divisors is an integer number (5145131280).

Almost surely, 2^20580236477 is an apocalyptic number.

It is an amenable number.

20580236477 is a deficient number, since it is larger than the sum of its proper divisors (288643).

20580236477 is a wasteful number, since it uses less digits than its factorization.

20580236477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288642.

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 20580236477 in words is "twenty billion, five hundred eighty million, two hundred thirty-six thousand, four hundred seventy-seven".