21780885

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{311}}^1$

素因数の和:378

約数の個数: 64

約数和(自身を含む): 43130880

約数和(自身を除く): 21349995

約数列:

[1, 3, 5, 7, 15, 21, 23, 29, 35, 69, 87, 105, 115, 145, 161, 203, 311, 345, 435, 483, 609, 667, 805, 933, 1015, 1555, 2001, 2177, 2415, 3045, 3335, 4665, 4669, 6531, 7153, 9019, 10005, 10885, 14007, 21459, 23345, 27057, 32655, 35765, 45095, 50071, 63133, 70035, 107295, 135285, 150213, 189399, 207437, 250355, 315665, 622311, 751065, 946995, 1037185, 1452059, 3111555, 4356177, 7260295, 21780885]

約数ペア:

[(1, 21780885), (3, 7260295), (5, 4356177), (7, 3111555), (15, 1452059), (21, 1037185), (23, 946995), (29, 751065), (35, 622311), (69, 315665), (87, 250355), (105, 207437), (115, 189399), (145, 150213), (161, 135285), (203, 107295), (311, 70035), (345, 63133), (435, 50071), (483, 45095), (609, 35765), (667, 32655), (805, 27057), (933, 23345), (1015, 21459), (1555, 14007), (2001, 10885), (2177, 10005), (2415, 9019), (3045, 7153), (3335, 6531), (4665, 4669)]