20655727172 has 6 divisors (see below), whose sum is σ = 36147522558. Its totient is φ = 10327863584.

The previous prime is 20655727159. The next prime is 20655727181. The reversal of 20655727172 is 27172755602.

It can be written as a sum of positive squares in only one way, i.e., 14069755456 + 6585971716 = 118616^2 + 81154^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2581965893 + ... + 2581965900.

It is an arithmetic number, because the mean of its divisors is an integer number (6024587093).

Almost surely, 2^20655727172 is an apocalyptic number.

It is an amenable number.

20655727172 is a deficient number, since it is larger than the sum of its proper divisors (15491795386).

20655727172 is a wasteful number, since it uses less digits than its factorization.

20655727172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163931797 (or 5163931795 counting only the distinct ones).

The product of its (nonzero) digits is 411600, while the sum is 44.

The spelling of 20655727172 in words is "twenty billion, six hundred fifty-five million, seven hundred twenty-seven thousand, one hundred seventy-two".