21228160

素因数分解:

$2^7\times 5^1\times {\mathrm{41}}^1\times {\mathrm{809}}^1$

素因数の和:869

約数の個数: 64

約数和(自身を含む): 52050600

約数和(自身を除く): 30822440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 128, 160, 164, 205, 320, 328, 410, 640, 656, 809, 820, 1312, 1618, 1640, 2624, 3236, 3280, 4045, 5248, 6472, 6560, 8090, 12944, 13120, 16180, 25888, 26240, 32360, 33169, 51776, 64720, 66338, 103552, 129440, 132676, 165845, 258880, 265352, 331690, 517760, 530704, 663380, 1061408, 1326760, 2122816, 2653520, 4245632, 5307040, 10614080, 21228160]

約数ペア:

[(1, 21228160), (2, 10614080), (4, 5307040), (5, 4245632), (8, 2653520), (10, 2122816), (16, 1326760), (20, 1061408), (32, 663380), (40, 530704), (41, 517760), (64, 331690), (80, 265352), (82, 258880), (128, 165845), (160, 132676), (164, 129440), (205, 103552), (320, 66338), (328, 64720), (410, 51776), (640, 33169), (656, 32360), (809, 26240), (820, 25888), (1312, 16180), (1618, 13120), (1640, 12944), (2624, 8090), (3236, 6560), (3280, 6472), (4045, 5248)]