20954647079 has 2 divisors, whose sum is σ = 20954647080. Its totient is φ = 20954647078.

The previous prime is 20954647069. The next prime is 20954647127. The reversal of 20954647079 is 97074645902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20954647079 - 2¹² = 20954642983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20954647079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20954647009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477323539 + 10477323540.

It is an arithmetic number, because the mean of its divisors is an integer number (10477323540).

Almost surely, 2^20954647079 is an apocalyptic number.

20954647079 is a deficient number, since it is larger than the sum of its proper divisors (1).

20954647079 is an equidigital number, since it uses as much as digits as its factorization.

20954647079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 20954647079 in words is "twenty billion, nine hundred fifty-four million, six hundred forty-seven thousand, seventy-nine".