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20124181 = 711261353
BaseRepresentation
bin100110011000…
…1001000010101
31101212102012001
41030301020111
520122433211
61555155301
7333024040
oct114611025
941772161
1020124181
11103a5660
1268a5b31
134227acc
14295bc57
151b77ac1
hex1331215

20124181 has 8 divisors (see below), whose sum is σ = 25089984. Its totient is φ = 15681120.

The previous prime is 20124179. The next prime is 20124191. The reversal of 20124181 is 18142102.

It is a happy number.

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

It is not a de Polignac number, because 20124181 - 21 = 20124179 is a prime.

It is a super-2 number, since 2×201241812 = 809965321841522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124101) 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, 130600 + ... + 130753.

It is an arithmetic number, because the mean of its divisors is an integer number (3136248).

Almost surely, 220124181 is an apocalyptic number.

It is an amenable number.

20124181 is a deficient number, since it is larger than the sum of its proper divisors (4965803).

20124181 is a wasteful number, since it uses less digits than its factorization.

20124181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261371.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 20124181 is about 4485.9983281317. The cubic root of 20124181 is about 272.0024013989.

Adding to 20124181 its reverse (18142102), we get a palindrome (38266283).

The spelling of 20124181 in words is "twenty million, one hundred twenty-four thousand, one hundred eighty-one".

Divisors: 1 7 11 77 261353 1829471 2874883 20124181