21005120

素因数分解:

$2^6\times 5^1\times {\mathrm{41}}^1\times {\mathrm{1601}}^1$

素因数の和:1659

約数の個数: 56

約数和(自身を含む): 51270408

約数和(自身を除く): 30265288

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 160, 164, 205, 320, 328, 410, 656, 820, 1312, 1601, 1640, 2624, 3202, 3280, 6404, 6560, 8005, 12808, 13120, 16010, 25616, 32020, 51232, 64040, 65641, 102464, 128080, 131282, 256160, 262564, 328205, 512320, 525128, 656410, 1050256, 1312820, 2100512, 2625640, 4201024, 5251280, 10502560, 21005120]

約数ペア:

[(1, 21005120), (2, 10502560), (4, 5251280), (5, 4201024), (8, 2625640), (10, 2100512), (16, 1312820), (20, 1050256), (32, 656410), (40, 525128), (41, 512320), (64, 328205), (80, 262564), (82, 256160), (160, 131282), (164, 128080), (205, 102464), (320, 65641), (328, 64040), (410, 51232), (656, 32020), (820, 25616), (1312, 16010), (1601, 13120), (1640, 12808), (2624, 8005), (3202, 6560), (3280, 6404)]