20941700

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{181}}^1$

素因数の和:297

約数の個数: 72

約数和(自身を含む): 49762440

約数和(自身を除く): 28820740

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 65, 89, 100, 130, 178, 181, 260, 325, 356, 362, 445, 650, 724, 890, 905, 1157, 1300, 1780, 1810, 2225, 2314, 2353, 3620, 4450, 4525, 4628, 4706, 5785, 8900, 9050, 9412, 11570, 11765, 16109, 18100, 23140, 23530, 28925, 32218, 47060, 57850, 58825, 64436, 80545, 115700, 117650, 161090, 209417, 235300, 322180, 402725, 418834, 805450, 837668, 1047085, 1610900, 2094170, 4188340, 5235425, 10470850, 20941700]

約数ペア:

[(1, 20941700), (2, 10470850), (4, 5235425), (5, 4188340), (10, 2094170), (13, 1610900), (20, 1047085), (25, 837668), (26, 805450), (50, 418834), (52, 402725), (65, 322180), (89, 235300), (100, 209417), (130, 161090), (178, 117650), (181, 115700), (260, 80545), (325, 64436), (356, 58825), (362, 57850), (445, 47060), (650, 32218), (724, 28925), (890, 23530), (905, 23140), (1157, 18100), (1300, 16109), (1780, 11765), (1810, 11570), (2225, 9412), (2314, 9050), (2353, 8900), (3620, 5785), (4450, 4706), (4525, 4628)]