20387675

素因数分解:

$5^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1$

素因数の和:141

約数の個数: 72

約数和(自身を含む): 34350480

約数和(自身を除く): 13962805

約数列:

[1, 5, 7, 11, 17, 25, 35, 49, 55, 77, 85, 89, 119, 175, 187, 245, 275, 385, 425, 445, 539, 595, 623, 833, 935, 979, 1225, 1309, 1513, 1925, 2225, 2695, 2975, 3115, 4165, 4361, 4675, 4895, 6545, 6853, 7565, 9163, 10591, 13475, 15575, 16643, 20825, 21805, 24475, 32725, 34265, 37825, 45815, 47971, 52955, 74137, 83215, 109025, 116501, 171325, 229075, 239855, 264775, 370685, 416075, 582505, 815507, 1199275, 1853425, 2912525, 4077535, 20387675]

約数ペア:

[(1, 20387675), (5, 4077535), (7, 2912525), (11, 1853425), (17, 1199275), (25, 815507), (35, 582505), (49, 416075), (55, 370685), (77, 264775), (85, 239855), (89, 229075), (119, 171325), (175, 116501), (187, 109025), (245, 83215), (275, 74137), (385, 52955), (425, 47971), (445, 45815), (539, 37825), (595, 34265), (623, 32725), (833, 24475), (935, 21805), (979, 20825), (1225, 16643), (1309, 15575), (1513, 13475), (1925, 10591), (2225, 9163), (2695, 7565), (2975, 6853), (3115, 6545), (4165, 4895), (4361, 4675)]