20580236478 has 12 divisors (see below), whose sum is σ = 44590512408. Its totient is φ = 6860078820.

The previous prime is 20580236473. The next prime is 20580236489. The reversal of 20580236478 is 87463208502.

20580236478 is a `hidden beast` number, since 2 + 0 + 580 + 2 + 3 + 64 + 7 + 8 = 666.

It is a super-2 number, since 2×20580236478² (a number of 21 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 571673218 + ... + 571673253.

It is an arithmetic number, because the mean of its divisors is an integer number (3715876034).

Almost surely, 2^20580236478 is an apocalyptic number.

20580236478 is an abundant number, since it is smaller than the sum of its proper divisors (24010275930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20580236478 is a wasteful number, since it uses less digits than its factorization.

20580236478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143346479 (or 1143346476 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 20580236478 in words is "twenty billion, five hundred eighty million, two hundred thirty-six thousand, four hundred seventy-eight".