20615264443 has 2 divisors, whose sum is σ = 20615264444. Its totient is φ = 20615264442.

The previous prime is 20615264393. The next prime is 20615264477. The reversal of 20615264443 is 34446251602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20615264443 - 2³³ = 12025329851 is a prime.

It is not a weakly prime, because it can be changed into another prime (20615267443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307632221 + 10307632222.

It is an arithmetic number, because the mean of its divisors is an integer number (10307632222).

Almost surely, 2^20615264443 is an apocalyptic number.

20615264443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20615264443 is an equidigital number, since it uses as much as digits as its factorization.

20615264443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 37.

It can be divided in two parts, 206 and 15264443, that added together give a square (15264649 = 3907²).

The spelling of 20615264443 in words is "twenty billion, six hundred fifteen million, two hundred sixty-four thousand, four hundred forty-three".