18720260

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{809}}^1$

素因数の和:920

約数の個数: 48

約数和(自身を含む): 42865200

約数和(自身を除く): 24144940

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 89, 130, 178, 260, 356, 445, 809, 890, 1157, 1618, 1780, 2314, 3236, 4045, 4628, 5785, 8090, 10517, 11570, 16180, 21034, 23140, 42068, 52585, 72001, 105170, 144002, 210340, 288004, 360005, 720010, 936013, 1440020, 1872026, 3744052, 4680065, 9360130, 18720260]

約数ペア:

[(1, 18720260), (2, 9360130), (4, 4680065), (5, 3744052), (10, 1872026), (13, 1440020), (20, 936013), (26, 720010), (52, 360005), (65, 288004), (89, 210340), (130, 144002), (178, 105170), (260, 72001), (356, 52585), (445, 42068), (809, 23140), (890, 21034), (1157, 16180), (1618, 11570), (1780, 10517), (2314, 8090), (3236, 5785), (4045, 4628)]