21269720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{1009}}^1$

素因数の和:1068

約数の個数: 64

約数和(自身を含む): 52358400

約数和(自身を除く): 31088680

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 31, 34, 40, 62, 68, 85, 124, 136, 155, 170, 248, 310, 340, 527, 620, 680, 1009, 1054, 1240, 2018, 2108, 2635, 4036, 4216, 5045, 5270, 8072, 10090, 10540, 17153, 20180, 21080, 31279, 34306, 40360, 62558, 68612, 85765, 125116, 137224, 156395, 171530, 250232, 312790, 343060, 531743, 625580, 686120, 1063486, 1251160, 2126972, 2658715, 4253944, 5317430, 10634860, 21269720]

約数ペア:

[(1, 21269720), (2, 10634860), (4, 5317430), (5, 4253944), (8, 2658715), (10, 2126972), (17, 1251160), (20, 1063486), (31, 686120), (34, 625580), (40, 531743), (62, 343060), (68, 312790), (85, 250232), (124, 171530), (136, 156395), (155, 137224), (170, 125116), (248, 85765), (310, 68612), (340, 62558), (527, 40360), (620, 34306), (680, 31279), (1009, 21080), (1054, 20180), (1240, 17153), (2018, 10540), (2108, 10090), (2635, 8072), (4036, 5270), (4216, 5045)]