20145860

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{337}}^1$

素因数の和:421

約数の個数: 72

約数和(自身を含む): 50168664

約数和(自身を除く): 30022804

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 61, 70, 98, 122, 140, 196, 244, 245, 305, 337, 427, 490, 610, 674, 854, 980, 1220, 1348, 1685, 1708, 2135, 2359, 2989, 3370, 4270, 4718, 5978, 6740, 8540, 9436, 11795, 11956, 14945, 16513, 20557, 23590, 29890, 33026, 41114, 47180, 59780, 66052, 82228, 82565, 102785, 143899, 165130, 205570, 287798, 330260, 411140, 575596, 719495, 1007293, 1438990, 2014586, 2877980, 4029172, 5036465, 10072930, 20145860]

約数ペア:

[(1, 20145860), (2, 10072930), (4, 5036465), (5, 4029172), (7, 2877980), (10, 2014586), (14, 1438990), (20, 1007293), (28, 719495), (35, 575596), (49, 411140), (61, 330260), (70, 287798), (98, 205570), (122, 165130), (140, 143899), (196, 102785), (244, 82565), (245, 82228), (305, 66052), (337, 59780), (427, 47180), (490, 41114), (610, 33026), (674, 29890), (854, 23590), (980, 20557), (1220, 16513), (1348, 14945), (1685, 11956), (1708, 11795), (2135, 9436), (2359, 8540), (2989, 6740), (3370, 5978), (4270, 4718)]