20017840

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{359}}^1$

素因数の和:430

約数の個数: 80

約数和(自身を含む): 50621760

約数和(自身を除く): 30603920

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 41, 68, 80, 82, 85, 136, 164, 170, 205, 272, 328, 340, 359, 410, 656, 680, 697, 718, 820, 1360, 1394, 1436, 1640, 1795, 2788, 2872, 3280, 3485, 3590, 5576, 5744, 6103, 6970, 7180, 11152, 12206, 13940, 14360, 14719, 24412, 27880, 28720, 29438, 30515, 48824, 55760, 58876, 61030, 73595, 97648, 117752, 122060, 147190, 235504, 244120, 250223, 294380, 488240, 500446, 588760, 1000892, 1177520, 1251115, 2001784, 2502230, 4003568, 5004460, 10008920, 20017840]

約数ペア:

[(1, 20017840), (2, 10008920), (4, 5004460), (5, 4003568), (8, 2502230), (10, 2001784), (16, 1251115), (17, 1177520), (20, 1000892), (34, 588760), (40, 500446), (41, 488240), (68, 294380), (80, 250223), (82, 244120), (85, 235504), (136, 147190), (164, 122060), (170, 117752), (205, 97648), (272, 73595), (328, 61030), (340, 58876), (359, 55760), (410, 48824), (656, 30515), (680, 29438), (697, 28720), (718, 27880), (820, 24412), (1360, 14719), (1394, 14360), (1436, 13940), (1640, 12206), (1795, 11152), (2788, 7180), (2872, 6970), (3280, 6103), (3485, 5744), (3590, 5576)]