20375740621 has 2 divisors, whose sum is σ = 20375740622. Its totient is φ = 20375740620.

The previous prime is 20375740607. The next prime is 20375740631. The reversal of 20375740621 is 12604757302.

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., 17216064100 + 3159676521 = 131210^2 + 56211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20375740621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20375740631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10187870310 + 10187870311.

It is an arithmetic number, because the mean of its divisors is an integer number (10187870311).

Almost surely, 2^20375740621 is an apocalyptic number.

It is an amenable number.

20375740621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20375740621 is an equidigital number, since it uses as much as digits as its factorization.

20375740621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 20375740621 in words is "twenty billion, three hundred seventy-five million, seven hundred forty thousand, six hundred twenty-one".