21558380

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{163}}^1\times {\mathrm{389}}^1$

素因数の和:578

約数の個数: 48

約数和(自身を含む): 48353760

約数和(自身を除く): 26795380

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 163, 170, 326, 340, 389, 652, 778, 815, 1556, 1630, 1945, 2771, 3260, 3890, 5542, 6613, 7780, 11084, 13226, 13855, 26452, 27710, 33065, 55420, 63407, 66130, 126814, 132260, 253628, 317035, 634070, 1077919, 1268140, 2155838, 4311676, 5389595, 10779190, 21558380]

約数ペア:

[(1, 21558380), (2, 10779190), (4, 5389595), (5, 4311676), (10, 2155838), (17, 1268140), (20, 1077919), (34, 634070), (68, 317035), (85, 253628), (163, 132260), (170, 126814), (326, 66130), (340, 63407), (389, 55420), (652, 33065), (778, 27710), (815, 26452), (1556, 13855), (1630, 13226), (1945, 11084), (2771, 7780), (3260, 6613), (3890, 5542)]