21042980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1$

素因数の和:189

約数の個数: 96

約数和(自身を含む): 53706240

約数和(自身を除く): 32663260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 58, 70, 71, 73, 116, 140, 142, 145, 146, 203, 284, 290, 292, 355, 365, 406, 497, 511, 580, 710, 730, 812, 994, 1015, 1022, 1420, 1460, 1988, 2030, 2044, 2059, 2117, 2485, 2555, 4060, 4118, 4234, 4970, 5110, 5183, 8236, 8468, 9940, 10220, 10295, 10366, 10585, 14413, 14819, 20590, 20732, 21170, 25915, 28826, 29638, 36281, 41180, 42340, 51830, 57652, 59276, 72065, 72562, 74095, 103660, 144130, 145124, 148190, 150307, 181405, 288260, 296380, 300614, 362810, 601228, 725620, 751535, 1052149, 1503070, 2104298, 3006140, 4208596, 5260745, 10521490, 21042980]

約数ペア:

[(1, 21042980), (2, 10521490), (4, 5260745), (5, 4208596), (7, 3006140), (10, 2104298), (14, 1503070), (20, 1052149), (28, 751535), (29, 725620), (35, 601228), (58, 362810), (70, 300614), (71, 296380), (73, 288260), (116, 181405), (140, 150307), (142, 148190), (145, 145124), (146, 144130), (203, 103660), (284, 74095), (290, 72562), (292, 72065), (355, 59276), (365, 57652), (406, 51830), (497, 42340), (511, 41180), (580, 36281), (710, 29638), (730, 28826), (812, 25915), (994, 21170), (1015, 20732), (1022, 20590), (1420, 14819), (1460, 14413), (1988, 10585), (2030, 10366), (2044, 10295), (2059, 10220), (2117, 9940), (2485, 8468), (2555, 8236), (4060, 5183), (4118, 5110), (4234, 4970)]