21000724720

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1033}}^1\times {\mathrm{1277}}^1$

素因数の和:2522

約数の個数: 80

約数和(自身を含む): 49158014400

約数和(自身を除く): 28157289680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1033, 1277, 1592, 1990, 2066, 2554, 3184, 3980, 4132, 5108, 5165, 6385, 7960, 8264, 10216, 10330, 12770, 15920, 16528, 20432, 20660, 25540, 41320, 51080, 82640, 102160, 205567, 254123, 411134, 508246, 822268, 1016492, 1027835, 1270615, 1319141, 1644536, 2032984, 2055670, 2541230, 2638282, 3289072, 4065968, 4111340, 5082460, 5276564, 6595705, 8222680, 10164920, 10553128, 13191410, 16445360, 20329840, 21106256, 26382820, 52765640, 105531280, 262509059, 525018118, 1050036236, 1312545295, 2100072472, 2625090590, 4200144944, 5250181180, 10500362360, 21000724720]

約数ペア:

[(1, 21000724720), (2, 10500362360), (4, 5250181180), (5, 4200144944), (8, 2625090590), (10, 2100072472), (16, 1312545295), (20, 1050036236), (40, 525018118), (80, 262509059), (199, 105531280), (398, 52765640), (796, 26382820), (995, 21106256), (1033, 20329840), (1277, 16445360), (1592, 13191410), (1990, 10553128), (2066, 10164920), (2554, 8222680), (3184, 6595705), (3980, 5276564), (4132, 5082460), (5108, 4111340), (5165, 4065968), (6385, 3289072), (7960, 2638282), (8264, 2541230), (10216, 2055670), (10330, 2032984), (12770, 1644536), (15920, 1319141), (16528, 1270615), (20432, 1027835), (20660, 1016492), (25540, 822268), (41320, 508246), (51080, 411134), (82640, 254123), (102160, 205567)]