20519381 has 12 divisors (see below), whose sum is σ = 21766080. Its totient is φ = 19339320.

The previous prime is 20519377. The next prime is 20519383. The reversal of 20519381 is 18391502.

It is not a de Polignac number, because 20519381 - 2² = 20519377 is a prime.

It is a super-2 number, since 2×20519381² = 842089993246322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20519383) 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 in 11 ways as a sum of consecutive naturals, for example, 41546 + ... + 42036.

It is an arithmetic number, because the mean of its divisors is an integer number (1813840).

Almost surely, 2^20519381 is an apocalyptic number.

It is an amenable number.

20519381 is a deficient number, since it is larger than the sum of its proper divisors (1246699).

20519381 is an equidigital number, since it uses as much as digits as its factorization.

20519381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616 (or 593 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 20519381 is about 4529.8323368531. The cubic root of 20519381 is about 273.7714052332.

The spelling of 20519381 in words is "twenty million, five hundred nineteen thousand, three hundred eighty-one".