20818473967 has 2 divisors, whose sum is σ = 20818473968. Its totient is φ = 20818473966.

The previous prime is 20818473947. The next prime is 20818474003. The reversal of 20818473967 is 76937481802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20818473967 - 2¹⁹ = 20817949679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20818473917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10409236983 + 10409236984.

It is an arithmetic number, because the mean of its divisors is an integer number (10409236984).

Almost surely, 2^20818473967 is an apocalyptic number.

20818473967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20818473967 is an equidigital number, since it uses as much as digits as its factorization.

20818473967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 20818473967 in words is "twenty billion, eight hundred eighteen million, four hundred seventy-three thousand, nine hundred sixty-seven".