21239205

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{149}}^1$

素因数の和:230

約数の個数: 64

約数和(自身を含む): 39916800

約数和(自身を除く): 18677595

約数列:

[1, 3, 5, 13, 15, 17, 39, 43, 51, 65, 85, 129, 149, 195, 215, 221, 255, 447, 559, 645, 663, 731, 745, 1105, 1677, 1937, 2193, 2235, 2533, 2795, 3315, 3655, 5811, 6407, 7599, 8385, 9503, 9685, 10965, 12665, 19221, 28509, 29055, 32035, 32929, 37995, 47515, 83291, 96105, 98787, 108919, 142545, 164645, 249873, 326757, 416455, 493935, 544595, 1249365, 1415947, 1633785, 4247841, 7079735, 21239205]

約数ペア:

[(1, 21239205), (3, 7079735), (5, 4247841), (13, 1633785), (15, 1415947), (17, 1249365), (39, 544595), (43, 493935), (51, 416455), (65, 326757), (85, 249873), (129, 164645), (149, 142545), (195, 108919), (215, 98787), (221, 96105), (255, 83291), (447, 47515), (559, 37995), (645, 32929), (663, 32035), (731, 29055), (745, 28509), (1105, 19221), (1677, 12665), (1937, 10965), (2193, 9685), (2235, 9503), (2533, 8385), (2795, 7599), (3315, 6407), (3655, 5811)]