21116720

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15527}}^1$

素因数の和:15557

約数の個数: 40

約数和(自身を含む): 51987744

約数和(自身を除く): 30871024

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15527, 31054, 62108, 77635, 124216, 155270, 248432, 263959, 310540, 527918, 621080, 1055836, 1242160, 1319795, 2111672, 2639590, 4223344, 5279180, 10558360, 21116720]

約数ペア:

[(1, 21116720), (2, 10558360), (4, 5279180), (5, 4223344), (8, 2639590), (10, 2111672), (16, 1319795), (17, 1242160), (20, 1055836), (34, 621080), (40, 527918), (68, 310540), (80, 263959), (85, 248432), (136, 155270), (170, 124216), (272, 77635), (340, 62108), (680, 31054), (1360, 15527)]