21286840

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{757}}^1$

素因数の和:824

約数の個数: 64

約数和(自身を含む): 51847200

約数和(自身を除く): 30560360

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 37, 38, 40, 74, 76, 95, 148, 152, 185, 190, 296, 370, 380, 703, 740, 757, 760, 1406, 1480, 1514, 2812, 3028, 3515, 3785, 5624, 6056, 7030, 7570, 14060, 14383, 15140, 28009, 28120, 28766, 30280, 56018, 57532, 71915, 112036, 115064, 140045, 143830, 224072, 280090, 287660, 532171, 560180, 575320, 1064342, 1120360, 2128684, 2660855, 4257368, 5321710, 10643420, 21286840]

約数ペア:

[(1, 21286840), (2, 10643420), (4, 5321710), (5, 4257368), (8, 2660855), (10, 2128684), (19, 1120360), (20, 1064342), (37, 575320), (38, 560180), (40, 532171), (74, 287660), (76, 280090), (95, 224072), (148, 143830), (152, 140045), (185, 115064), (190, 112036), (296, 71915), (370, 57532), (380, 56018), (703, 30280), (740, 28766), (757, 28120), (760, 28009), (1406, 15140), (1480, 14383), (1514, 14060), (2812, 7570), (3028, 7030), (3515, 6056), (3785, 5624)]