20838961841 has 2 divisors, whose sum is σ = 20838961842. Its totient is φ = 20838961840.

The previous prime is 20838961831. The next prime is 20838961859. The reversal of 20838961841 is 14816983802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20828262400 + 10699441 = 144320^2 + 3271^2 .

It is a cyclic number.

It is not a de Polignac number, because 20838961841 - 2¹⁸ = 20838699697 is a prime.

It is a super-2 number, since 2×20838961841² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20838961841.

It is not a weakly prime, because it can be changed into another prime (20838961831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419480920 + 10419480921.

It is an arithmetic number, because the mean of its divisors is an integer number (10419480921).

Almost surely, 2^20838961841 is an apocalyptic number.

It is an amenable number.

20838961841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20838961841 is an equidigital number, since it uses as much as digits as its factorization.

20838961841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 20838961841 in words is "twenty billion, eight hundred thirty-eight million, nine hundred sixty-one thousand, eight hundred forty-one".