21020356

素因数分解:

$2^2\times 7^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{397}}^1$

素因数の和:500

約数の個数: 48

約数和(自身を含む): 44219392

約数和(自身を除く): 23199036

約数列:

[1, 2, 4, 7, 14, 28, 31, 61, 62, 122, 124, 217, 244, 397, 427, 434, 794, 854, 868, 1588, 1708, 1891, 2779, 3782, 5558, 7564, 11116, 12307, 13237, 24217, 24614, 26474, 48434, 49228, 52948, 86149, 96868, 169519, 172298, 339038, 344596, 678076, 750727, 1501454, 3002908, 5255089, 10510178, 21020356]

約数ペア:

[(1, 21020356), (2, 10510178), (4, 5255089), (7, 3002908), (14, 1501454), (28, 750727), (31, 678076), (61, 344596), (62, 339038), (122, 172298), (124, 169519), (217, 96868), (244, 86149), (397, 52948), (427, 49228), (434, 48434), (794, 26474), (854, 24614), (868, 24217), (1588, 13237), (1708, 12307), (1891, 11116), (2779, 7564), (3782, 5558)]