20128240

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{257}}^1$

素因数の和:370

約数の個数: 80

約数和(自身を含む): 51827040

約数和(自身を除く): 31698800

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 89, 110, 176, 178, 220, 257, 356, 440, 445, 514, 712, 880, 890, 979, 1028, 1285, 1424, 1780, 1958, 2056, 2570, 2827, 3560, 3916, 4112, 4895, 5140, 5654, 7120, 7832, 9790, 10280, 11308, 14135, 15664, 19580, 20560, 22616, 22873, 28270, 39160, 45232, 45746, 56540, 78320, 91492, 113080, 114365, 182984, 226160, 228730, 251603, 365968, 457460, 503206, 914920, 1006412, 1258015, 1829840, 2012824, 2516030, 4025648, 5032060, 10064120, 20128240]

約数ペア:

[(1, 20128240), (2, 10064120), (4, 5032060), (5, 4025648), (8, 2516030), (10, 2012824), (11, 1829840), (16, 1258015), (20, 1006412), (22, 914920), (40, 503206), (44, 457460), (55, 365968), (80, 251603), (88, 228730), (89, 226160), (110, 182984), (176, 114365), (178, 113080), (220, 91492), (257, 78320), (356, 56540), (440, 45746), (445, 45232), (514, 39160), (712, 28270), (880, 22873), (890, 22616), (979, 20560), (1028, 19580), (1285, 15664), (1424, 14135), (1780, 11308), (1958, 10280), (2056, 9790), (2570, 7832), (2827, 7120), (3560, 5654), (3916, 5140), (4112, 4895)]