21399320

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{761}}^1$

素因数の和:828

約数の個数: 64

約数和(自身を含む): 52120800

約数和(自身を除く): 30721480

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, 760, 761, 1406, 1480, 1522, 2812, 3044, 3515, 3805, 5624, 6088, 7030, 7610, 14060, 14459, 15220, 28120, 28157, 28918, 30440, 56314, 57836, 72295, 112628, 115672, 140785, 144590, 225256, 281570, 289180, 534983, 563140, 578360, 1069966, 1126280, 2139932, 2674915, 4279864, 5349830, 10699660, 21399320]

約数ペア:

[(1, 21399320), (2, 10699660), (4, 5349830), (5, 4279864), (8, 2674915), (10, 2139932), (19, 1126280), (20, 1069966), (37, 578360), (38, 563140), (40, 534983), (74, 289180), (76, 281570), (95, 225256), (148, 144590), (152, 140785), (185, 115672), (190, 112628), (296, 72295), (370, 57836), (380, 56314), (703, 30440), (740, 28918), (760, 28157), (761, 28120), (1406, 15220), (1480, 14459), (1522, 14060), (2812, 7610), (3044, 7030), (3515, 6088), (3805, 5624)]