1020020381 has 2 divisors, whose sum is σ = 1020020382. Its totient is φ = 1020020380.

The previous prime is 1020020333. The next prime is 1020020401. The reversal of 1020020381 is 1830200201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 780699481 + 239320900 = 27941^2 + 15470^2 .

It is an emirp because it is prime and its reverse (1830200201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020020381 is a prime.

It is a super-2 number, since 2×1020020381² = 2080883155310770322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020220381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510010190 + 510010191.

It is an arithmetic number, because the mean of its divisors is an integer number (510010191).

Almost surely, 2^1020020381 is an apocalyptic number.

It is an amenable number.

1020020381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020020381 is an equidigital number, since it uses as much as digits as its factorization.

1020020381 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 1020020381 is about 31937.7579206807. The cubic root of 1020020381 is about 1006.6294140832.

Adding to 1020020381 its reverse (1830200201), we get a palindrome (2850220582).

The spelling of 1020020381 in words is "one billion, twenty million, twenty thousand, three hundred eighty-one".