20987820

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{16657}}^1$

素因数の和:16679

約数の個数: 72

約数和(自身を含む): 72762144

約数和(自身を除く): 51774324

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 16657, 33314, 49971, 66628, 83285, 99942, 116599, 149913, 166570, 199884, 233198, 249855, 299826, 333140, 349797, 466396, 499710, 582995, 599652, 699594, 749565, 999420, 1049391, 1165990, 1399188, 1499130, 1748985, 2098782, 2331980, 2998260, 3497970, 4197564, 5246955, 6995940, 10493910, 20987820]

約数ペア:

[(1, 20987820), (2, 10493910), (3, 6995940), (4, 5246955), (5, 4197564), (6, 3497970), (7, 2998260), (9, 2331980), (10, 2098782), (12, 1748985), (14, 1499130), (15, 1399188), (18, 1165990), (20, 1049391), (21, 999420), (28, 749565), (30, 699594), (35, 599652), (36, 582995), (42, 499710), (45, 466396), (60, 349797), (63, 333140), (70, 299826), (84, 249855), (90, 233198), (105, 199884), (126, 166570), (140, 149913), (180, 116599), (210, 99942), (252, 83285), (315, 66628), (420, 49971), (630, 33314), (1260, 16657)]