20976631243 has 2 divisors, whose sum is σ = 20976631244. Its totient is φ = 20976631242.

The previous prime is 20976631229. The next prime is 20976631271. The reversal of 20976631243 is 34213667902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20976631243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20976631243.

It is not a weakly prime, because it can be changed into another prime (20976634243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488315621 + 10488315622.

It is an arithmetic number, because the mean of its divisors is an integer number (10488315622).

Almost surely, 2^20976631243 is an apocalyptic number.

20976631243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20976631243 is an equidigital number, since it uses as much as digits as its factorization.

20976631243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 43.

The spelling of 20976631243 in words is "twenty billion, nine hundred seventy-six million, six hundred thirty-one thousand, two hundred forty-three".