20857220359237 has 2 divisors, whose sum is σ = 20857220359238. Its totient is φ = 20857220359236.

The previous prime is 20857220359219. The next prime is 20857220359243. The reversal of 20857220359237 is 73295302275802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15722604850276 + 5134615508961 = 3965174^2 + 2265969^2 .

It is a cyclic number.

It is not a de Polignac number, because 20857220359237 - 2¹⁹ = 20857219834949 is a prime.

It is a super-2 number, since 2×20857220359237² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20857220359207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10428610179618 + 10428610179619.

It is an arithmetic number, because the mean of its divisors is an integer number (10428610179619).

Almost surely, 2^{20857220359237} is an apocalyptic number.

It is an amenable number.

20857220359237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20857220359237 is an equidigital number, since it uses as much as digits as its factorization.

20857220359237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12700800, while the sum is 55.

The spelling of 20857220359237 in words is "twenty trillion, eight hundred fifty-seven billion, two hundred twenty million, three hundred fifty-nine thousand, two hundred thirty-seven".