20427481 has 8 divisors (see below), whose sum is σ = 21385728. Its totient is φ = 19488000.

The previous prime is 20427461. The next prime is 20427499. The reversal of 20427481 is 18472402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20427481 - 2⁹ = 20426969 is a prime.

It is a super-2 number, since 2×20427481² = 834563960010722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20427461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2440 + ... + 6841.

It is an arithmetic number, because the mean of its divisors is an integer number (2673216).

Almost surely, 2^20427481 is an apocalyptic number.

It is an amenable number.

20427481 is a deficient number, since it is larger than the sum of its proper divisors (958247).

20427481 is an equidigital number, since it uses as much as digits as its factorization.

20427481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9383.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20427481 is about 4519.6770902355. The cubic root of 20427481 is about 273.3620808881.

Adding to 20427481 its reverse (18472402), we get a palindrome (38899883).

The spelling of 20427481 in words is "twenty million, four hundred twenty-seven thousand, four hundred eighty-one".