20356740541 has 2 divisors, whose sum is σ = 20356740542. Its totient is φ = 20356740540.

The previous prime is 20356740497. The next prime is 20356740557. The reversal of 20356740541 is 14504765302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12609044100 + 7747696441 = 112290^2 + 88021^2 .

It is a cyclic number.

It is not a de Polignac number, because 20356740541 - 2²⁷ = 20222522813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20356740541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20356740641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178370270 + 10178370271.

It is an arithmetic number, because the mean of its divisors is an integer number (10178370271).

Almost surely, 2^20356740541 is an apocalyptic number.

It is an amenable number.

20356740541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356740541 is an equidigital number, since it uses as much as digits as its factorization.

20356740541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 20356740541 in words is "twenty billion, three hundred fifty-six million, seven hundred forty thousand, five hundred forty-one".