21677720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{449}}^1$

素因数の和:548

約数の個数: 64

約数和(自身を含む): 52488000

約数和(自身を除く): 30810280

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 71, 85, 136, 142, 170, 284, 340, 355, 449, 568, 680, 710, 898, 1207, 1420, 1796, 2245, 2414, 2840, 3592, 4490, 4828, 6035, 7633, 8980, 9656, 12070, 15266, 17960, 24140, 30532, 31879, 38165, 48280, 61064, 63758, 76330, 127516, 152660, 159395, 255032, 305320, 318790, 541943, 637580, 1083886, 1275160, 2167772, 2709715, 4335544, 5419430, 10838860, 21677720]

約数ペア:

[(1, 21677720), (2, 10838860), (4, 5419430), (5, 4335544), (8, 2709715), (10, 2167772), (17, 1275160), (20, 1083886), (34, 637580), (40, 541943), (68, 318790), (71, 305320), (85, 255032), (136, 159395), (142, 152660), (170, 127516), (284, 76330), (340, 63758), (355, 61064), (449, 48280), (568, 38165), (680, 31879), (710, 30532), (898, 24140), (1207, 17960), (1420, 15266), (1796, 12070), (2245, 9656), (2414, 8980), (2840, 7633), (3592, 6035), (4490, 4828)]