281990020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{4391}}^1$

素因数の和:4445

約数の個数: 72

約数和(自身を含む): 675138240

約数和(自身を除く): 393148220

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 52, 65, 76, 95, 130, 169, 190, 247, 260, 338, 380, 494, 676, 845, 988, 1235, 1690, 2470, 3211, 3380, 4391, 4940, 6422, 8782, 12844, 16055, 17564, 21955, 32110, 43910, 57083, 64220, 83429, 87820, 114166, 166858, 228332, 285415, 333716, 417145, 570830, 742079, 834290, 1084577, 1141660, 1484158, 1668580, 2169154, 2968316, 3710395, 4338308, 5422885, 7420790, 10845770, 14099501, 14841580, 21691540, 28199002, 56398004, 70497505, 140995010, 281990020]

約数ペア:

[(1, 281990020), (2, 140995010), (4, 70497505), (5, 56398004), (10, 28199002), (13, 21691540), (19, 14841580), (20, 14099501), (26, 10845770), (38, 7420790), (52, 5422885), (65, 4338308), (76, 3710395), (95, 2968316), (130, 2169154), (169, 1668580), (190, 1484158), (247, 1141660), (260, 1084577), (338, 834290), (380, 742079), (494, 570830), (676, 417145), (845, 333716), (988, 285415), (1235, 228332), (1690, 166858), (2470, 114166), (3211, 87820), (3380, 83429), (4391, 64220), (4940, 57083), (6422, 43910), (8782, 32110), (12844, 21955), (16055, 17564)]