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20731148 = 227172997
BaseRepresentation
bin100111100010…
…1010100001100
31110000020210022
41033011110030
520301344043
62020201312
7341132444
oct117052414
943006708
1020731148
111077a689
126b39238
1343ab169
142a79124
151c47868
hex13c550c

20731148 has 12 divisors (see below), whose sum is σ = 36790992. Its totient is φ = 10219440.

The previous prime is 20731133. The next prime is 20731153. The reversal of 20731148 is 84113702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36215 + ... + 36782.

It is an arithmetic number, because the mean of its divisors is an integer number (3065916).

Almost surely, 220731148 is an apocalyptic number.

It is an amenable number.

20731148 is a deficient number, since it is larger than the sum of its proper divisors (16059844).

20731148 is a wasteful number, since it uses less digits than its factorization.

20731148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73072 (or 73070 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20731148 is about 4553.1470435293. The cubic root of 20731148 is about 274.7099884799.

The spelling of 20731148 in words is "twenty million, seven hundred thirty-one thousand, one hundred forty-eight".

Divisors: 1 2 4 71 142 284 72997 145994 291988 5182787 10365574 20731148