19982990

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{61}}^1$

素因数の和:173

約数の個数: 64

約数和(自身を含む): 40497408

約数和(自身を除く): 20514418

約数列:

[1, 2, 5, 10, 17, 34, 41, 47, 61, 82, 85, 94, 122, 170, 205, 235, 305, 410, 470, 610, 697, 799, 1037, 1394, 1598, 1927, 2074, 2501, 2867, 3485, 3854, 3995, 5002, 5185, 5734, 6970, 7990, 9635, 10370, 12505, 14335, 19270, 25010, 28670, 32759, 42517, 48739, 65518, 85034, 97478, 117547, 163795, 212585, 235094, 243695, 327590, 425170, 487390, 587735, 1175470, 1998299, 3996598, 9991495, 19982990]

約数ペア:

[(1, 19982990), (2, 9991495), (5, 3996598), (10, 1998299), (17, 1175470), (34, 587735), (41, 487390), (47, 425170), (61, 327590), (82, 243695), (85, 235094), (94, 212585), (122, 163795), (170, 117547), (205, 97478), (235, 85034), (305, 65518), (410, 48739), (470, 42517), (610, 32759), (697, 28670), (799, 25010), (1037, 19270), (1394, 14335), (1598, 12505), (1927, 10370), (2074, 9635), (2501, 7990), (2867, 6970), (3485, 5734), (3854, 5185), (3995, 5002)]