21262240

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7817}}^1$

素因数の和:7849

約数の個数: 48

約数和(自身を含む): 53193672

約数和(自身を除く): 31931432

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, 7817, 15634, 31268, 39085, 62536, 78170, 125072, 132889, 156340, 250144, 265778, 312680, 531556, 625360, 664445, 1063112, 1250720, 1328890, 2126224, 2657780, 4252448, 5315560, 10631120, 21262240]

約数ペア:

[(1, 21262240), (2, 10631120), (4, 5315560), (5, 4252448), (8, 2657780), (10, 2126224), (16, 1328890), (17, 1250720), (20, 1063112), (32, 664445), (34, 625360), (40, 531556), (68, 312680), (80, 265778), (85, 250144), (136, 156340), (160, 132889), (170, 125072), (272, 78170), (340, 62536), (544, 39085), (680, 31268), (1360, 15634), (2720, 7817)]