20534381 has 16 divisors (see below), whose sum is σ = 24182400. Its totient is φ = 17428320.

The previous prime is 20534359. The next prime is 20534387. The reversal of 20534381 is 18343502.

It is a de Polignac number, because none of the positive numbers 2^k-20534381 is a prime.

It is a super-2 number, since 2×20534381² = 843321606106322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20534381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534387) 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 15 ways as a sum of consecutive naturals, for example, 44705 + ... + 45161.

It is an arithmetic number, because the mean of its divisors is an integer number (1511400).

Almost surely, 2^20534381 is an apocalyptic number.

It is an amenable number.

20534381 is a deficient number, since it is larger than the sum of its proper divisors (3648019).

20534381 is an equidigital number, since it uses as much as digits as its factorization.

20534381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20534381 is about 4531.4877247986. The cubic root of 20534381 is about 273.8380994288.

Adding to 20534381 its reverse (18343502), we get a palindrome (38877883).

The spelling of 20534381 in words is "twenty million, five hundred thirty-four thousand, three hundred eighty-one".