21385640

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^2\times {\mathrm{1481}}^1$

素因数の和:1530

約数の個数: 48

約数和(自身を含む): 50817780

約数和(自身を除く): 29432140

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 152, 190, 361, 380, 722, 760, 1444, 1481, 1805, 2888, 2962, 3610, 5924, 7220, 7405, 11848, 14440, 14810, 28139, 29620, 56278, 59240, 112556, 140695, 225112, 281390, 534641, 562780, 1069282, 1125560, 2138564, 2673205, 4277128, 5346410, 10692820, 21385640]

約数ペア:

[(1, 21385640), (2, 10692820), (4, 5346410), (5, 4277128), (8, 2673205), (10, 2138564), (19, 1125560), (20, 1069282), (38, 562780), (40, 534641), (76, 281390), (95, 225112), (152, 140695), (190, 112556), (361, 59240), (380, 56278), (722, 29620), (760, 28139), (1444, 14810), (1481, 14440), (1805, 11848), (2888, 7405), (2962, 7220), (3610, 5924)]