19910995

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{487}}^1$

素因数の和:559

約数の個数: 32

約数和(自身を含む): 28038528

約数和(自身を除く): 8127533

約数列:

[1, 5, 13, 17, 37, 65, 85, 185, 221, 481, 487, 629, 1105, 2405, 2435, 3145, 6331, 8177, 8279, 18019, 31655, 40885, 41395, 90095, 107627, 234247, 306323, 538135, 1171235, 1531615, 3982199, 19910995]

約数ペア:

[(1, 19910995), (5, 3982199), (13, 1531615), (17, 1171235), (37, 538135), (65, 306323), (85, 234247), (185, 107627), (221, 90095), (481, 41395), (487, 40885), (629, 31655), (1105, 18019), (2405, 8279), (2435, 8177), (3145, 6331)]