21129948

素因数分解:

$2^2\times 3^2\times 7^1\times {\mathrm{191}}^1\times {\mathrm{439}}^1$

素因数の和:647

約数の個数: 72

約数和(自身を含む): 61501440

約数和(自身を除く): 40371492

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 191, 252, 382, 439, 573, 764, 878, 1146, 1317, 1337, 1719, 1756, 2292, 2634, 2674, 3073, 3438, 3951, 4011, 5268, 5348, 6146, 6876, 7902, 8022, 9219, 12033, 12292, 15804, 16044, 18438, 24066, 27657, 36876, 48132, 55314, 83849, 110628, 167698, 251547, 335396, 503094, 586943, 754641, 1006188, 1173886, 1509282, 1760829, 2347772, 3018564, 3521658, 5282487, 7043316, 10564974, 21129948]

約数ペア:

[(1, 21129948), (2, 10564974), (3, 7043316), (4, 5282487), (6, 3521658), (7, 3018564), (9, 2347772), (12, 1760829), (14, 1509282), (18, 1173886), (21, 1006188), (28, 754641), (36, 586943), (42, 503094), (63, 335396), (84, 251547), (126, 167698), (191, 110628), (252, 83849), (382, 55314), (439, 48132), (573, 36876), (764, 27657), (878, 24066), (1146, 18438), (1317, 16044), (1337, 15804), (1719, 12292), (1756, 12033), (2292, 9219), (2634, 8022), (2674, 7902), (3073, 6876), (3438, 6146), (3951, 5348), (4011, 5268)]