21997220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{2213}}^1$

素因数の和:2300

約数の個数: 48

約数和(自身を含む): 53561088

約数和(自身を除く): 31563868

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2213, 2485, 4426, 4970, 8852, 9940, 11065, 15491, 22130, 30982, 44260, 61964, 77455, 154910, 157123, 309820, 314246, 628492, 785615, 1099861, 1571230, 2199722, 3142460, 4399444, 5499305, 10998610, 21997220]

約数ペア:

[(1, 21997220), (2, 10998610), (4, 5499305), (5, 4399444), (7, 3142460), (10, 2199722), (14, 1571230), (20, 1099861), (28, 785615), (35, 628492), (70, 314246), (71, 309820), (140, 157123), (142, 154910), (284, 77455), (355, 61964), (497, 44260), (710, 30982), (994, 22130), (1420, 15491), (1988, 11065), (2213, 9940), (2485, 8852), (4426, 4970)]