20648960

素因数分解:

$2^{10}\times 5^1\times {\mathrm{37}}^1\times {\mathrm{109}}^1$

素因数の和:171

約数の個数: 88

約数和(自身を含む): 51338760

約数和(自身を除く): 30689800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 37, 40, 64, 74, 80, 109, 128, 148, 160, 185, 218, 256, 296, 320, 370, 436, 512, 545, 592, 640, 740, 872, 1024, 1090, 1184, 1280, 1480, 1744, 2180, 2368, 2560, 2960, 3488, 4033, 4360, 4736, 5120, 5920, 6976, 8066, 8720, 9472, 11840, 13952, 16132, 17440, 18944, 20165, 23680, 27904, 32264, 34880, 37888, 40330, 47360, 55808, 64528, 69760, 80660, 94720, 111616, 129056, 139520, 161320, 189440, 258112, 279040, 322640, 516224, 558080, 645280, 1032448, 1290560, 2064896, 2581120, 4129792, 5162240, 10324480, 20648960]

約数ペア:

[(1, 20648960), (2, 10324480), (4, 5162240), (5, 4129792), (8, 2581120), (10, 2064896), (16, 1290560), (20, 1032448), (32, 645280), (37, 558080), (40, 516224), (64, 322640), (74, 279040), (80, 258112), (109, 189440), (128, 161320), (148, 139520), (160, 129056), (185, 111616), (218, 94720), (256, 80660), (296, 69760), (320, 64528), (370, 55808), (436, 47360), (512, 40330), (545, 37888), (592, 34880), (640, 32264), (740, 27904), (872, 23680), (1024, 20165), (1090, 18944), (1184, 17440), (1280, 16132), (1480, 13952), (1744, 11840), (2180, 9472), (2368, 8720), (2560, 8066), (2960, 6976), (3488, 5920), (4033, 5120), (4360, 4736)]