21507040

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7907}}^1$

素因数の和:7939

約数の個数: 48

約数和(自身を含む): 53806032

約数和(自身を除く): 32298992

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, 7907, 15814, 31628, 39535, 63256, 79070, 126512, 134419, 158140, 253024, 268838, 316280, 537676, 632560, 672095, 1075352, 1265120, 1344190, 2150704, 2688380, 4301408, 5376760, 10753520, 21507040]

約数ペア:

[(1, 21507040), (2, 10753520), (4, 5376760), (5, 4301408), (8, 2688380), (10, 2150704), (16, 1344190), (17, 1265120), (20, 1075352), (32, 672095), (34, 632560), (40, 537676), (68, 316280), (80, 268838), (85, 253024), (136, 158140), (160, 134419), (170, 126512), (272, 79070), (340, 63256), (544, 39535), (680, 31628), (1360, 15814), (2720, 7907)]