81878620

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^2\times {\mathrm{71}}^1\times {\mathrm{109}}^1$

素因数の和:235

約数の個数: 72

約数和(自身を含む): 183949920

約数和(自身を除く): 102071300

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 71, 92, 109, 115, 142, 218, 230, 284, 355, 436, 460, 529, 545, 710, 1058, 1090, 1420, 1633, 2116, 2180, 2507, 2645, 3266, 5014, 5290, 6532, 7739, 8165, 10028, 10580, 12535, 15478, 16330, 25070, 30956, 32660, 37559, 38695, 50140, 57661, 75118, 77390, 115322, 150236, 154780, 177997, 187795, 230644, 288305, 355994, 375590, 576610, 711988, 751180, 889985, 1153220, 1779970, 3559940, 4093931, 8187862, 16375724, 20469655, 40939310, 81878620]

約数ペア:

[(1, 81878620), (2, 40939310), (4, 20469655), (5, 16375724), (10, 8187862), (20, 4093931), (23, 3559940), (46, 1779970), (71, 1153220), (92, 889985), (109, 751180), (115, 711988), (142, 576610), (218, 375590), (230, 355994), (284, 288305), (355, 230644), (436, 187795), (460, 177997), (529, 154780), (545, 150236), (710, 115322), (1058, 77390), (1090, 75118), (1420, 57661), (1633, 50140), (2116, 38695), (2180, 37559), (2507, 32660), (2645, 30956), (3266, 25070), (5014, 16330), (5290, 15478), (6532, 12535), (7739, 10580), (8165, 10028)]