20888920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^2\times {\mathrm{139}}^1$

素因数の和:197

約数の個数: 96

約数和(自身を含む): 54154800

約数和(自身を除く): 33265880

約数列:

[1, 2, 4, 5, 8, 10, 13, 17, 20, 26, 34, 40, 52, 65, 68, 85, 104, 130, 136, 139, 170, 221, 260, 278, 289, 340, 442, 520, 556, 578, 680, 695, 884, 1105, 1112, 1156, 1390, 1445, 1768, 1807, 2210, 2312, 2363, 2780, 2890, 3614, 3757, 4420, 4726, 5560, 5780, 7228, 7514, 8840, 9035, 9452, 11560, 11815, 14456, 15028, 18070, 18785, 18904, 23630, 30056, 30719, 36140, 37570, 40171, 47260, 61438, 72280, 75140, 80342, 94520, 122876, 150280, 153595, 160684, 200855, 245752, 307190, 321368, 401710, 522223, 614380, 803420, 1044446, 1228760, 1606840, 2088892, 2611115, 4177784, 5222230, 10444460, 20888920]

約数ペア:

[(1, 20888920), (2, 10444460), (4, 5222230), (5, 4177784), (8, 2611115), (10, 2088892), (13, 1606840), (17, 1228760), (20, 1044446), (26, 803420), (34, 614380), (40, 522223), (52, 401710), (65, 321368), (68, 307190), (85, 245752), (104, 200855), (130, 160684), (136, 153595), (139, 150280), (170, 122876), (221, 94520), (260, 80342), (278, 75140), (289, 72280), (340, 61438), (442, 47260), (520, 40171), (556, 37570), (578, 36140), (680, 30719), (695, 30056), (884, 23630), (1105, 18904), (1112, 18785), (1156, 18070), (1390, 15028), (1445, 14456), (1768, 11815), (1807, 11560), (2210, 9452), (2312, 9035), (2363, 8840), (2780, 7514), (2890, 7228), (3614, 5780), (3757, 5560), (4420, 4726)]