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20831396 = 2229179581
BaseRepresentation
bin100111101110…
…1110010100100
31110012100022012
41033131302210
520313101041
62022253352
7342030635
oct117356244
943170265
1020831396
1110838a33
126b87258
134414991
142aa388c
151c673eb
hex13ddca4

20831396 has 12 divisors (see below), whose sum is σ = 37712220. Its totient is φ = 10056480.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831396 is 69313802.

It can be written as a sum of positive squares in 2 ways, for example, as 3724900 + 17106496 = 1930^2 + 4136^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89675 + ... + 89906.

It is an arithmetic number, because the mean of its divisors is an integer number (3142685).

Almost surely, 220831396 is an apocalyptic number.

It is an amenable number.

20831396 is a deficient number, since it is larger than the sum of its proper divisors (16880824).

20831396 is a wasteful number, since it uses less digits than its factorization.

20831396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179614 (or 179612 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20831396 is about 4564.1424167088. The cubic root of 20831396 is about 275.1520745652.

The spelling of 20831396 in words is "twenty million, eight hundred thirty-one thousand, three hundred ninety-six".

Divisors: 1 2 4 29 58 116 179581 359162 718324 5207849 10415698 20831396