20294740689961 has 2 divisors, whose sum is σ = 20294740689962. Its totient is φ = 20294740689960.

The previous prime is 20294740689947. The next prime is 20294740689967. The reversal of 20294740689961 is 16998604749202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18484152462400 + 1810588227561 = 4299320^2 + 1345581^2 .

It is a cyclic number.

It is not a de Polignac number, because 20294740689961 - 2⁹ = 20294740689449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20294740689967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10147370344980 + 10147370344981.

It is an arithmetic number, because the mean of its divisors is an integer number (10147370344981).

Almost surely, 2^{20294740689961} is an apocalyptic number.

It is an amenable number.

20294740689961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20294740689961 is an equidigital number, since it uses as much as digits as its factorization.

20294740689961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94058496, while the sum is 67.

The spelling of 20294740689961 in words is "twenty trillion, two hundred ninety-four billion, seven hundred forty million, six hundred eighty-nine thousand, nine hundred sixty-one".