20447240267 has 2 divisors, whose sum is σ = 20447240268. Its totient is φ = 20447240266.

The previous prime is 20447240201. The next prime is 20447240291. The reversal of 20447240267 is 76204274402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20447240267 - 2¹² = 20447236171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20447240267.

It is not a weakly prime, because it can be changed into another prime (20447240167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223620133 + 10223620134.

It is an arithmetic number, because the mean of its divisors is an integer number (10223620134).

Almost surely, 2^20447240267 is an apocalyptic number.

20447240267 is a deficient number, since it is larger than the sum of its proper divisors (1).

20447240267 is an equidigital number, since it uses as much as digits as its factorization.

20447240267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 38.

The spelling of 20447240267 in words is "twenty billion, four hundred forty-seven million, two hundred forty thousand, two hundred sixty-seven".