21257240

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{271}}^1$

素因数の和:372

約数の個数: 64

約数和(自身を含む): 50232960

約数和(自身を除く): 28975720

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 53, 74, 106, 148, 185, 212, 265, 271, 296, 370, 424, 530, 542, 740, 1060, 1084, 1355, 1480, 1961, 2120, 2168, 2710, 3922, 5420, 7844, 9805, 10027, 10840, 14363, 15688, 19610, 20054, 28726, 39220, 40108, 50135, 57452, 71815, 78440, 80216, 100270, 114904, 143630, 200540, 287260, 401080, 531431, 574520, 1062862, 2125724, 2657155, 4251448, 5314310, 10628620, 21257240]

約数ペア:

[(1, 21257240), (2, 10628620), (4, 5314310), (5, 4251448), (8, 2657155), (10, 2125724), (20, 1062862), (37, 574520), (40, 531431), (53, 401080), (74, 287260), (106, 200540), (148, 143630), (185, 114904), (212, 100270), (265, 80216), (271, 78440), (296, 71815), (370, 57452), (424, 50135), (530, 40108), (542, 39220), (740, 28726), (1060, 20054), (1084, 19610), (1355, 15688), (1480, 14363), (1961, 10840), (2120, 10027), (2168, 9805), (2710, 7844), (3922, 5420)]