20117481 has 8 divisors (see below), whose sum is σ = 27688704. Its totient is φ = 12978960.

The previous prime is 20117473. The next prime is 20117497. The reversal of 20117481 is 18471102.

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

It is not a de Polignac number, because 20117481 - 2³ = 20117473 is a prime.

It is a super-2 number, since 2×20117481² = 809426083570722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20117401) 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, 108066 + ... + 108251.

It is an arithmetic number, because the mean of its divisors is an integer number (3461088).

Almost surely, 2^20117481 is an apocalyptic number.

It is an amenable number.

20117481 is a deficient number, since it is larger than the sum of its proper divisors (7571223).

20117481 is a wasteful number, since it uses less digits than its factorization.

20117481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216351.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 20117481 is about 4485.2514979653. The cubic root of 20117481 is about 271.9722118743.

Adding to 20117481 its reverse (18471102), we get a palindrome (38588583).

The spelling of 20117481 in words is "twenty million, one hundred seventeen thousand, four hundred eighty-one".