20039481 has 96 divisors (see below), whose sum is σ = 40383360. Its totient is φ = 9797760.

The previous prime is 20039479. The next prime is 20039497. The reversal of 20039481 is 18493002.

It is not a de Polignac number, because 20039481 - 2¹ = 20039479 is a prime.

It is a super-2 number, since 2×20039481² = 803161597498722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20039581) 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 95 ways as a sum of consecutive naturals, for example, 1178785 + ... + 1178801.

It is an arithmetic number, because the mean of its divisors is an integer number (420660).

Almost surely, 2^20039481 is an apocalyptic number.

20039481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20039481 is an abundant number, since it is smaller than the sum of its proper divisors (20343879).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20039481 is an equidigital number, since it uses as much as digits as its factorization.

20039481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20039481 is about 4476.5478887196. The cubic root of 20039481 is about 271.6202574610.

The spelling of 20039481 in words is "twenty million, thirty-nine thousand, four hundred eighty-one".