21765328

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{269}}^1\times {\mathrm{389}}^1$

素因数の和:679

約数の個数: 40

約数和(自身を含む): 45700200

約数和(自身を除く): 23934872

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 269, 389, 538, 778, 1076, 1556, 2152, 3112, 3497, 4304, 5057, 6224, 6994, 10114, 13988, 20228, 27976, 40456, 55952, 80912, 104641, 209282, 418564, 837128, 1360333, 1674256, 2720666, 5441332, 10882664, 21765328]

約数ペア:

[(1, 21765328), (2, 10882664), (4, 5441332), (8, 2720666), (13, 1674256), (16, 1360333), (26, 837128), (52, 418564), (104, 209282), (208, 104641), (269, 80912), (389, 55952), (538, 40456), (778, 27976), (1076, 20228), (1556, 13988), (2152, 10114), (3112, 6994), (3497, 6224), (4304, 5057)]