19968640

素因数分解:

$2^7\times 5^1\times {\mathrm{41}}^1\times {\mathrm{761}}^1$

素因数の和:821

約数の個数: 64

約数和(自身を含む): 48966120

約数和(自身を除く): 28997480

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, 761, 820, 1312, 1522, 1640, 2624, 3044, 3280, 3805, 5248, 6088, 6560, 7610, 12176, 13120, 15220, 24352, 26240, 30440, 31201, 48704, 60880, 62402, 97408, 121760, 124804, 156005, 243520, 249608, 312010, 487040, 499216, 624020, 998432, 1248040, 1996864, 2496080, 3993728, 4992160, 9984320, 19968640]

約数ペア:

[(1, 19968640), (2, 9984320), (4, 4992160), (5, 3993728), (8, 2496080), (10, 1996864), (16, 1248040), (20, 998432), (32, 624020), (40, 499216), (41, 487040), (64, 312010), (80, 249608), (82, 243520), (128, 156005), (160, 124804), (164, 121760), (205, 97408), (320, 62402), (328, 60880), (410, 48704), (640, 31201), (656, 30440), (761, 26240), (820, 24352), (1312, 15220), (1522, 13120), (1640, 12176), (2624, 7610), (3044, 6560), (3280, 6088), (3805, 5248)]