21890128

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{191}}^1$

素因数の和:260

約数の個数: 80

約数和(自身を含む): 49996800

約数和(自身を除く): 28106672

約数列:

[1, 2, 4, 8, 13, 16, 19, 26, 29, 38, 52, 58, 76, 104, 116, 152, 191, 208, 232, 247, 304, 377, 382, 464, 494, 551, 754, 764, 988, 1102, 1508, 1528, 1976, 2204, 2483, 3016, 3056, 3629, 3952, 4408, 4966, 5539, 6032, 7163, 7258, 8816, 9932, 11078, 14326, 14516, 19864, 22156, 28652, 29032, 39728, 44312, 47177, 57304, 58064, 72007, 88624, 94354, 105241, 114608, 144014, 188708, 210482, 288028, 377416, 420964, 576056, 754832, 841928, 1152112, 1368133, 1683856, 2736266, 5472532, 10945064, 21890128]

約数ペア:

[(1, 21890128), (2, 10945064), (4, 5472532), (8, 2736266), (13, 1683856), (16, 1368133), (19, 1152112), (26, 841928), (29, 754832), (38, 576056), (52, 420964), (58, 377416), (76, 288028), (104, 210482), (116, 188708), (152, 144014), (191, 114608), (208, 105241), (232, 94354), (247, 88624), (304, 72007), (377, 58064), (382, 57304), (464, 47177), (494, 44312), (551, 39728), (754, 29032), (764, 28652), (988, 22156), (1102, 19864), (1508, 14516), (1528, 14326), (1976, 11078), (2204, 9932), (2483, 8816), (3016, 7258), (3056, 7163), (3629, 6032), (3952, 5539), (4408, 4966)]