21290480

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6491}}^1$

素因数の和:6545

約数の個数: 40

約数和(自身を含む): 50715504

約数和(自身を除く): 29425024

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6491, 12982, 25964, 32455, 51928, 64910, 103856, 129820, 259640, 266131, 519280, 532262, 1064524, 1330655, 2129048, 2661310, 4258096, 5322620, 10645240, 21290480]

約数ペア:

[(1, 21290480), (2, 10645240), (4, 5322620), (5, 4258096), (8, 2661310), (10, 2129048), (16, 1330655), (20, 1064524), (40, 532262), (41, 519280), (80, 266131), (82, 259640), (164, 129820), (205, 103856), (328, 64910), (410, 51928), (656, 32455), (820, 25964), (1640, 12982), (3280, 6491)]