21757785

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:198

約数の個数: 64

約数和(自身を含む): 41902080

約数和(自身を除く): 20144295

約数列:

[1, 3, 5, 7, 15, 21, 35, 43, 61, 79, 105, 129, 183, 215, 237, 301, 305, 395, 427, 553, 645, 903, 915, 1185, 1281, 1505, 1659, 2135, 2623, 2765, 3397, 4515, 4819, 6405, 7869, 8295, 10191, 13115, 14457, 16985, 18361, 23779, 24095, 33733, 39345, 50955, 55083, 71337, 72285, 91805, 101199, 118895, 168665, 207217, 275415, 356685, 505995, 621651, 1036085, 1450519, 3108255, 4351557, 7252595, 21757785]

約数ペア:

[(1, 21757785), (3, 7252595), (5, 4351557), (7, 3108255), (15, 1450519), (21, 1036085), (35, 621651), (43, 505995), (61, 356685), (79, 275415), (105, 207217), (129, 168665), (183, 118895), (215, 101199), (237, 91805), (301, 72285), (305, 71337), (395, 55083), (427, 50955), (553, 39345), (645, 33733), (903, 24095), (915, 23779), (1185, 18361), (1281, 16985), (1505, 14457), (1659, 13115), (2135, 10191), (2623, 8295), (2765, 7869), (3397, 6405), (4515, 4819)]