20993951267 has 2 divisors, whose sum is σ = 20993951268. Its totient is φ = 20993951266.

The previous prime is 20993951263. The next prime is 20993951273. The reversal of 20993951267 is 76215939902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20993951267 - 2² = 20993951263 is a prime.

It is not a weakly prime, because it can be changed into another prime (20993951263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496975633 + 10496975634.

It is an arithmetic number, because the mean of its divisors is an integer number (10496975634).

Almost surely, 2^20993951267 is an apocalyptic number.

20993951267 is a deficient number, since it is larger than the sum of its proper divisors (1).

20993951267 is an equidigital number, since it uses as much as digits as its factorization.

20993951267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 20993951267 in words is "twenty billion, nine hundred ninety-three million, nine hundred fifty-one thousand, two hundred sixty-seven".