20523541573 has 2 divisors, whose sum is σ = 20523541574. Its totient is φ = 20523541572.

The previous prime is 20523541547. The next prime is 20523541579. The reversal of 20523541573 is 37514532502.

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., 12824883009 + 7698658564 = 113247^2 + 87742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523541573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20523541579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261770786 + 10261770787.

It is an arithmetic number, because the mean of its divisors is an integer number (10261770787).

Almost surely, 2^20523541573 is an apocalyptic number.

It is an amenable number.

20523541573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523541573 is an equidigital number, since it uses as much as digits as its factorization.

20523541573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 20523541573 in words is "twenty billion, five hundred twenty-three million, five hundred forty-one thousand, five hundred seventy-three".