21490720

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7901}}^1$

素因数の和:7933

約数の個数: 48

約数和(自身を含む): 53765208

約数和(自身を除く): 32274488

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 340, 544, 680, 1360, 2720, 7901, 15802, 31604, 39505, 63208, 79010, 126416, 134317, 158020, 252832, 268634, 316040, 537268, 632080, 671585, 1074536, 1264160, 1343170, 2149072, 2686340, 4298144, 5372680, 10745360, 21490720]

約数ペア:

[(1, 21490720), (2, 10745360), (4, 5372680), (5, 4298144), (8, 2686340), (10, 2149072), (16, 1343170), (17, 1264160), (20, 1074536), (32, 671585), (34, 632080), (40, 537268), (68, 316040), (80, 268634), (85, 252832), (136, 158020), (160, 134317), (170, 126416), (272, 79010), (340, 63208), (544, 39505), (680, 31604), (1360, 15802), (2720, 7901)]