20117487 has 16 divisors (see below), whose sum is σ = 29321600. Its totient is φ = 12193632.

The previous prime is 20117473. The next prime is 20117497. The reversal of 20117487 is 78471102.

It is not a de Polignac number, because 20117487 - 2⁷ = 20117359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237 + ... + 6462.

It is an arithmetic number, because the mean of its divisors is an integer number (1832600).

Almost surely, 2^20117487 is an apocalyptic number.

20117487 is a deficient number, since it is larger than the sum of its proper divisors (9204113).

20117487 is a wasteful number, since it uses less digits than its factorization.

20117487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 20117487 is about 4485.2521668241. The cubic root of 20117487 is about 271.9722389127.

Adding to 20117487 its reverse (78471102), we get a palindrome (98588589).

It can be divided in two parts, 20117 and 487, that multiplied together give a palindrome (9796979).

The spelling of 20117487 in words is "twenty million, one hundred seventeen thousand, four hundred eighty-seven".