21379880

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{1367}}^1$

素因数の和:1418

約数の個数: 64

約数和(自身を含む): 53187840

約数和(自身を除く): 31807960

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 23, 34, 40, 46, 68, 85, 92, 115, 136, 170, 184, 230, 340, 391, 460, 680, 782, 920, 1367, 1564, 1955, 2734, 3128, 3910, 5468, 6835, 7820, 10936, 13670, 15640, 23239, 27340, 31441, 46478, 54680, 62882, 92956, 116195, 125764, 157205, 185912, 232390, 251528, 314410, 464780, 534497, 628820, 929560, 1068994, 1257640, 2137988, 2672485, 4275976, 5344970, 10689940, 21379880]

約数ペア:

[(1, 21379880), (2, 10689940), (4, 5344970), (5, 4275976), (8, 2672485), (10, 2137988), (17, 1257640), (20, 1068994), (23, 929560), (34, 628820), (40, 534497), (46, 464780), (68, 314410), (85, 251528), (92, 232390), (115, 185912), (136, 157205), (170, 125764), (184, 116195), (230, 92956), (340, 62882), (391, 54680), (460, 46478), (680, 31441), (782, 27340), (920, 23239), (1367, 15640), (1564, 13670), (1955, 10936), (2734, 7820), (3128, 6835), (3910, 5468)]