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20438131 = 717415971
BaseRepresentation
bin100110111110…
…1110001110011
31102110100211211
41031331301303
520213010011
62010020551
7335502250
oct115756163
942410754
1020438131
111059a51a
126a17757
13430798c
142a00427
151bdab21
hex137dc73

20438131 has 32 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 15590400.

The previous prime is 20438123. The next prime is 20438147. The reversal of 20438131 is 13183402.

20438131 = 3542 + 3552 + ... + 4722.

It is not a de Polignac number, because 20438131 - 23 = 20438123 is a prime.

It is a super-2 number, since 2×204381312 = 835434397546322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20438161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287826 + ... + 287896.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 220438131 is an apocalyptic number.

20438131 is a deficient number, since it is larger than the sum of its proper divisors (5689229).

20438131 is a wasteful number, since it uses less digits than its factorization.

20438131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20438131 is about 4520.8551182271. The cubic root of 20438131 is about 273.4095790005.

The spelling of 20438131 in words is "twenty million, four hundred thirty-eight thousand, one hundred thirty-one".

Divisors: 1 7 17 41 59 71 119 287 413 497 697 1003 1207 2419 2911 4189 4879 7021 8449 16933 20377 29323 41123 49487 71213 171749 287861 346409 498491 1202243 2919733 20438131