21213025

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1$

素因数の和:154

約数の個数: 48

約数和(自身を含む): 30533760

約数和(自身を除く): 9320735

約数列:

[1, 5, 17, 19, 25, 37, 71, 85, 95, 185, 323, 355, 425, 475, 629, 703, 925, 1207, 1349, 1615, 1775, 2627, 3145, 3515, 6035, 6745, 8075, 11951, 13135, 15725, 17575, 22933, 30175, 33725, 44659, 49913, 59755, 65675, 114665, 223295, 249565, 298775, 573325, 848521, 1116475, 1247825, 4242605, 21213025]

約数ペア:

[(1, 21213025), (5, 4242605), (17, 1247825), (19, 1116475), (25, 848521), (37, 573325), (71, 298775), (85, 249565), (95, 223295), (185, 114665), (323, 65675), (355, 59755), (425, 49913), (475, 44659), (629, 33725), (703, 30175), (925, 22933), (1207, 17575), (1349, 15725), (1615, 13135), (1775, 11951), (2627, 8075), (3145, 6745), (3515, 6035)]