20447677321 has 2 divisors, whose sum is σ = 20447677322. Its totient is φ = 20447677320.

The previous prime is 20447677307. The next prime is 20447677343. The reversal of 20447677321 is 12377674402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18350495296 + 2097182025 = 135464^2 + 45795^2 .

It is a cyclic number.

It is not a de Polignac number, because 20447677321 - 2¹³ = 20447669129 is a prime.

It is not a weakly prime, because it can be changed into another prime (20447677301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223838660 + 10223838661.

It is an arithmetic number, because the mean of its divisors is an integer number (10223838661).

Almost surely, 2^20447677321 is an apocalyptic number.

It is an amenable number.

20447677321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20447677321 is an equidigital number, since it uses as much as digits as its factorization.

20447677321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 43.

The spelling of 20447677321 in words is "twenty billion, four hundred forty-seven million, six hundred seventy-seven thousand, three hundred twenty-one".