21268775

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:200

約数の個数: 36

約数和(自身を含む): 29685600

約数和(自身を除く): 8416825

約数列:

[1, 5, 11, 25, 55, 79, 89, 121, 275, 395, 445, 605, 869, 979, 1975, 2225, 3025, 4345, 4895, 7031, 9559, 10769, 21725, 24475, 35155, 47795, 53845, 77341, 175775, 238975, 269225, 386705, 850751, 1933525, 4253755, 21268775]

約数ペア:

[(1, 21268775), (5, 4253755), (11, 1933525), (25, 850751), (55, 386705), (79, 269225), (89, 238975), (121, 175775), (275, 77341), (395, 53845), (445, 47795), (605, 35155), (869, 24475), (979, 21725), (1975, 10769), (2225, 9559), (3025, 7031), (4345, 4895)]