19978640

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{73}}^1\times {\mathrm{311}}^1$

素因数の和:408

約数の個数: 80

約数和(自身を含む): 51532416

約数和(自身を除く): 31553776

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 73, 80, 88, 110, 146, 176, 220, 292, 311, 365, 440, 584, 622, 730, 803, 880, 1168, 1244, 1460, 1555, 1606, 2488, 2920, 3110, 3212, 3421, 4015, 4976, 5840, 6220, 6424, 6842, 8030, 12440, 12848, 13684, 16060, 17105, 22703, 24880, 27368, 32120, 34210, 45406, 54736, 64240, 68420, 90812, 113515, 136840, 181624, 227030, 249733, 273680, 363248, 454060, 499466, 908120, 998932, 1248665, 1816240, 1997864, 2497330, 3995728, 4994660, 9989320, 19978640]

約数ペア:

[(1, 19978640), (2, 9989320), (4, 4994660), (5, 3995728), (8, 2497330), (10, 1997864), (11, 1816240), (16, 1248665), (20, 998932), (22, 908120), (40, 499466), (44, 454060), (55, 363248), (73, 273680), (80, 249733), (88, 227030), (110, 181624), (146, 136840), (176, 113515), (220, 90812), (292, 68420), (311, 64240), (365, 54736), (440, 45406), (584, 34210), (622, 32120), (730, 27368), (803, 24880), (880, 22703), (1168, 17105), (1244, 16060), (1460, 13684), (1555, 12848), (1606, 12440), (2488, 8030), (2920, 6842), (3110, 6424), (3212, 6220), (3421, 5840), (4015, 4976)]