21494980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{1759}}^1$

素因数の和:1828

約数の個数: 48

約数和(自身を含む): 49674240

約数和(自身を除く): 28179260

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 47, 52, 65, 94, 130, 188, 235, 260, 470, 611, 940, 1222, 1759, 2444, 3055, 3518, 6110, 7036, 8795, 12220, 17590, 22867, 35180, 45734, 82673, 91468, 114335, 165346, 228670, 330692, 413365, 457340, 826730, 1074749, 1653460, 2149498, 4298996, 5373745, 10747490, 21494980]

約数ペア:

[(1, 21494980), (2, 10747490), (4, 5373745), (5, 4298996), (10, 2149498), (13, 1653460), (20, 1074749), (26, 826730), (47, 457340), (52, 413365), (65, 330692), (94, 228670), (130, 165346), (188, 114335), (235, 91468), (260, 82673), (470, 45734), (611, 35180), (940, 22867), (1222, 17590), (1759, 12220), (2444, 8795), (3055, 7036), (3518, 6110)]