21815420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{307}}^1$

素因数の和:363

約数の個数: 96

約数和(自身を含む): 55883520

約数和(自身を除く): 34068100

約数列:

[1, 2, 4, 5, 10, 11, 17, 19, 20, 22, 34, 38, 44, 55, 68, 76, 85, 95, 110, 170, 187, 190, 209, 220, 307, 323, 340, 374, 380, 418, 614, 646, 748, 836, 935, 1045, 1228, 1292, 1535, 1615, 1870, 2090, 3070, 3230, 3377, 3553, 3740, 4180, 5219, 5833, 6140, 6460, 6754, 7106, 10438, 11666, 13508, 14212, 16885, 17765, 20876, 23332, 26095, 29165, 33770, 35530, 52190, 57409, 58330, 64163, 67540, 71060, 99161, 104380, 114818, 116660, 128326, 198322, 229636, 256652, 287045, 320815, 396644, 495805, 574090, 641630, 991610, 1090771, 1148180, 1283260, 1983220, 2181542, 4363084, 5453855, 10907710, 21815420]

約数ペア:

[(1, 21815420), (2, 10907710), (4, 5453855), (5, 4363084), (10, 2181542), (11, 1983220), (17, 1283260), (19, 1148180), (20, 1090771), (22, 991610), (34, 641630), (38, 574090), (44, 495805), (55, 396644), (68, 320815), (76, 287045), (85, 256652), (95, 229636), (110, 198322), (170, 128326), (187, 116660), (190, 114818), (209, 104380), (220, 99161), (307, 71060), (323, 67540), (340, 64163), (374, 58330), (380, 57409), (418, 52190), (614, 35530), (646, 33770), (748, 29165), (836, 26095), (935, 23332), (1045, 20876), (1228, 17765), (1292, 16885), (1535, 14212), (1615, 13508), (1870, 11666), (2090, 10438), (3070, 7106), (3230, 6754), (3377, 6460), (3553, 6140), (3740, 5833), (4180, 5219)]