20402223437 has 2 divisors, whose sum is σ = 20402223438. Its totient is φ = 20402223436.

The previous prime is 20402223431. The next prime is 20402223473. The reversal of 20402223437 is 73432220402.

Together with next prime (20402223473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15224845321 + 5177378116 = 123389^2 + 71954^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402223437 - 2¹⁰ = 20402222413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402223431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201111718 + 10201111719.

It is an arithmetic number, because the mean of its divisors is an integer number (10201111719).

Almost surely, 2^20402223437 is an apocalyptic number.

It is an amenable number.

20402223437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402223437 is an equidigital number, since it uses as much as digits as its factorization.

20402223437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 29.

Adding to 20402223437 its reverse (73432220402), we get a palindrome (93834443839).

The spelling of 20402223437 in words is "twenty billion, four hundred two million, two hundred twenty-three thousand, four hundred thirty-seven".