20343440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{631}}^1$

素因数の和:688

約数の個数: 80

約数和(自身を含む): 52663296

約数和(自身を除く): 32319856

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 40, 52, 62, 65, 80, 104, 124, 130, 155, 208, 248, 260, 310, 403, 496, 520, 620, 631, 806, 1040, 1240, 1262, 1612, 2015, 2480, 2524, 3155, 3224, 4030, 5048, 6310, 6448, 8060, 8203, 10096, 12620, 16120, 16406, 19561, 25240, 32240, 32812, 39122, 41015, 50480, 65624, 78244, 82030, 97805, 131248, 156488, 164060, 195610, 254293, 312976, 328120, 391220, 508586, 656240, 782440, 1017172, 1271465, 1564880, 2034344, 2542930, 4068688, 5085860, 10171720, 20343440]

約数ペア:

[(1, 20343440), (2, 10171720), (4, 5085860), (5, 4068688), (8, 2542930), (10, 2034344), (13, 1564880), (16, 1271465), (20, 1017172), (26, 782440), (31, 656240), (40, 508586), (52, 391220), (62, 328120), (65, 312976), (80, 254293), (104, 195610), (124, 164060), (130, 156488), (155, 131248), (208, 97805), (248, 82030), (260, 78244), (310, 65624), (403, 50480), (496, 41015), (520, 39122), (620, 32812), (631, 32240), (806, 25240), (1040, 19561), (1240, 16406), (1262, 16120), (1612, 12620), (2015, 10096), (2480, 8203), (2524, 8060), (3155, 6448), (3224, 6310), (4030, 5048)]