21903784

素因数分解:

$2^3\times 7^2\times {\mathrm{71}}^1\times {\mathrm{787}}^1$

素因数の和:878

約数の個数: 48

約数和(自身を含む): 48509280

約数和(自身を除く): 26605496

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 71, 98, 142, 196, 284, 392, 497, 568, 787, 994, 1574, 1988, 3148, 3479, 3976, 5509, 6296, 6958, 11018, 13916, 22036, 27832, 38563, 44072, 55877, 77126, 111754, 154252, 223508, 308504, 391139, 447016, 782278, 1564556, 2737973, 3129112, 5475946, 10951892, 21903784]

約数ペア:

[(1, 21903784), (2, 10951892), (4, 5475946), (7, 3129112), (8, 2737973), (14, 1564556), (28, 782278), (49, 447016), (56, 391139), (71, 308504), (98, 223508), (142, 154252), (196, 111754), (284, 77126), (392, 55877), (497, 44072), (568, 38563), (787, 27832), (994, 22036), (1574, 13916), (1988, 11018), (3148, 6958), (3479, 6296), (3976, 5509)]