20405577406 has 8 divisors (see below), whose sum is σ = 30905535024. Its totient is φ = 10103732400.

The previous prime is 20405577397. The next prime is 20405577407. The reversal of 20405577406 is 60477550402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405577407) 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, 49527895 + ... + 49528306.

It is an arithmetic number, because the mean of its divisors is an integer number (3863191878).

Almost surely, 2^20405577406 is an apocalyptic number.

20405577406 is a deficient number, since it is larger than the sum of its proper divisors (10499957618).

20405577406 is a wasteful number, since it uses less digits than its factorization.

20405577406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99056306.

The product of its (nonzero) digits is 235200, while the sum is 40.

The spelling of 20405577406 in words is "twenty billion, four hundred five million, five hundred seventy-seven thousand, four hundred six".