666880

素因数分解:

$2^8\times 5^1\times {\mathrm{521}}^1$

素因数の和:542

約数の個数: 36

約数和(自身を含む): 1600452

約数和(自身を除く): 933572

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 521, 640, 1042, 1280, 2084, 2605, 4168, 5210, 8336, 10420, 16672, 20840, 33344, 41680, 66688, 83360, 133376, 166720, 333440, 666880]

約数ペア:

[(1, 666880), (2, 333440), (4, 166720), (5, 133376), (8, 83360), (10, 66688), (16, 41680), (20, 33344), (32, 20840), (40, 16672), (64, 10420), (80, 8336), (128, 5210), (160, 4168), (256, 2605), (320, 2084), (521, 1280), (640, 1042)]