81686540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{211}}^1\times {\mathrm{1489}}^1$

素因数の和:1722

約数の個数: 48

約数和(自身を含む): 185737440

約数和(自身を除く): 104050900

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 211, 260, 422, 844, 1055, 1489, 2110, 2743, 2978, 4220, 5486, 5956, 7445, 10972, 13715, 14890, 19357, 27430, 29780, 38714, 54860, 77428, 96785, 193570, 314179, 387140, 628358, 1256716, 1570895, 3141790, 4084327, 6283580, 8168654, 16337308, 20421635, 40843270, 81686540]

約数ペア:

[(1, 81686540), (2, 40843270), (4, 20421635), (5, 16337308), (10, 8168654), (13, 6283580), (20, 4084327), (26, 3141790), (52, 1570895), (65, 1256716), (130, 628358), (211, 387140), (260, 314179), (422, 193570), (844, 96785), (1055, 77428), (1489, 54860), (2110, 38714), (2743, 29780), (2978, 27430), (4220, 19357), (5486, 14890), (5956, 13715), (7445, 10972)]