21000643240

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{1471}}^1\times {\mathrm{5851}}^1$

素因数の和:7394

約数の個数: 64

約数和(自身を含む): 48066923520

約数和(自身を除く): 27066280280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 1471, 2440, 2942, 5851, 5884, 7355, 11702, 11768, 14710, 23404, 29255, 29420, 46808, 58510, 58840, 89731, 117020, 179462, 234040, 356911, 358924, 448655, 713822, 717848, 897310, 1427644, 1784555, 1794620, 2855288, 3569110, 3589240, 7138220, 8606821, 14276440, 17213642, 34427284, 43034105, 68854568, 86068210, 172136420, 344272840, 525016081, 1050032162, 2100064324, 2625080405, 4200128648, 5250160810, 10500321620, 21000643240]

約数ペア:

[(1, 21000643240), (2, 10500321620), (4, 5250160810), (5, 4200128648), (8, 2625080405), (10, 2100064324), (20, 1050032162), (40, 525016081), (61, 344272840), (122, 172136420), (244, 86068210), (305, 68854568), (488, 43034105), (610, 34427284), (1220, 17213642), (1471, 14276440), (2440, 8606821), (2942, 7138220), (5851, 3589240), (5884, 3569110), (7355, 2855288), (11702, 1794620), (11768, 1784555), (14710, 1427644), (23404, 897310), (29255, 717848), (29420, 713822), (46808, 448655), (58510, 358924), (58840, 356911), (89731, 234040), (117020, 179462)]