21484520

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12491}}^1$

素因数の和:12545

約数の個数: 32

約数和(自身を含む): 49468320

約数和(自身を除く): 27983800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12491, 24982, 49964, 62455, 99928, 124910, 249820, 499640, 537113, 1074226, 2148452, 2685565, 4296904, 5371130, 10742260, 21484520]

約数ペア:

[(1, 21484520), (2, 10742260), (4, 5371130), (5, 4296904), (8, 2685565), (10, 2148452), (20, 1074226), (40, 537113), (43, 499640), (86, 249820), (172, 124910), (215, 99928), (344, 62455), (430, 49964), (860, 24982), (1720, 12491)]