18966940

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{37}}^1\times {\mathrm{71}}^1$

素因数の和:155

約数の個数: 72

約数和(自身を含む): 43781472

約数和(自身を除く): 24814532

約数列:

[1, 2, 4, 5, 10, 19, 20, 37, 38, 71, 74, 76, 95, 142, 148, 185, 190, 284, 355, 361, 370, 380, 703, 710, 722, 740, 1349, 1406, 1420, 1444, 1805, 2627, 2698, 2812, 3515, 3610, 5254, 5396, 6745, 7030, 7220, 10508, 13135, 13357, 13490, 14060, 25631, 26270, 26714, 26980, 49913, 51262, 52540, 53428, 66785, 99826, 102524, 128155, 133570, 199652, 249565, 256310, 267140, 499130, 512620, 948347, 998260, 1896694, 3793388, 4741735, 9483470, 18966940]

約数ペア:

[(1, 18966940), (2, 9483470), (4, 4741735), (5, 3793388), (10, 1896694), (19, 998260), (20, 948347), (37, 512620), (38, 499130), (71, 267140), (74, 256310), (76, 249565), (95, 199652), (142, 133570), (148, 128155), (185, 102524), (190, 99826), (284, 66785), (355, 53428), (361, 52540), (370, 51262), (380, 49913), (703, 26980), (710, 26714), (722, 26270), (740, 25631), (1349, 14060), (1406, 13490), (1420, 13357), (1444, 13135), (1805, 10508), (2627, 7220), (2698, 7030), (2812, 6745), (3515, 5396), (3610, 5254)]