20420572892437 has 2 divisors, whose sum is σ = 20420572892438. Its totient is φ = 20420572892436.

The previous prime is 20420572892413. The next prime is 20420572892477. The reversal of 20420572892437 is 73429827502402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12046181919121 + 8374390973316 = 3470761^2 + 2893854^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420572892437 - 2³¹ = 20418425408789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420572892477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210286446218 + 10210286446219.

It is an arithmetic number, because the mean of its divisors is an integer number (10210286446219).

Almost surely, 2^{20420572892437} is an apocalyptic number.

It is an amenable number.

20420572892437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420572892437 is an equidigital number, since it uses as much as digits as its factorization.

20420572892437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 20420572892437 in words is "twenty trillion, four hundred twenty billion, five hundred seventy-two million, eight hundred ninety-two thousand, four hundred thirty-seven".