2781940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{641}}^1$

素因数の和:688

約数の個数: 48

約数和(自身を含む): 6902784

約数和(自身を除く): 4120844

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 641, 868, 1085, 1282, 2170, 2564, 3205, 4340, 4487, 6410, 8974, 12820, 17948, 19871, 22435, 39742, 44870, 79484, 89740, 99355, 139097, 198710, 278194, 397420, 556388, 695485, 1390970, 2781940]

約数ペア:

[(1, 2781940), (2, 1390970), (4, 695485), (5, 556388), (7, 397420), (10, 278194), (14, 198710), (20, 139097), (28, 99355), (31, 89740), (35, 79484), (62, 44870), (70, 39742), (124, 22435), (140, 19871), (155, 17948), (217, 12820), (310, 8974), (434, 6410), (620, 4487), (641, 4340), (868, 3205), (1085, 2564), (1282, 2170)]