20201381 has 2 divisors, whose sum is σ = 20201382. Its totient is φ = 20201380.

The previous prime is 20201359. The next prime is 20201387. The reversal of 20201381 is 18310202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 8702500 = 3391^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201381 - 2¹⁸ = 19939237 is a prime.

It is a super-2 number, since 2×20201381² = 816191588614322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100690 + 10100691.

It is an arithmetic number, because the mean of its divisors is an integer number (10100691).

Almost surely, 2^20201381 is an apocalyptic number.

It is an amenable number.

20201381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201381 is an equidigital number, since it uses as much as digits as its factorization.

20201381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20201381 is about 4494.5946424566. The cubic root of 20201381 is about 272.3497743928.

Adding to 20201381 its reverse (18310202), we get a palindrome (38511583).

The spelling of 20201381 in words is "twenty million, two hundred one thousand, three hundred eighty-one".