21000331775

素因数分解:

$5^2\times {\mathrm{53}}^1\times {\mathrm{157}}^2\times {\mathrm{643}}^1$

素因数の和:1020

約数の個数: 36

約数和(自身を含む): 26743335192

約数和(自身を除く): 5743003417

約数列:

[1, 5, 25, 53, 157, 265, 643, 785, 1325, 3215, 3925, 8321, 16075, 24649, 34079, 41605, 100951, 123245, 170395, 208025, 504755, 616225, 851975, 1306397, 2523775, 5350403, 6531985, 15849307, 26752015, 32659925, 79246535, 133760075, 396232675, 840013271, 4200066355, 21000331775]

約数ペア:

[(1, 21000331775), (5, 4200066355), (25, 840013271), (53, 396232675), (157, 133760075), (265, 79246535), (643, 32659925), (785, 26752015), (1325, 15849307), (3215, 6531985), (3925, 5350403), (8321, 2523775), (16075, 1306397), (24649, 851975), (34079, 616225), (41605, 504755), (100951, 208025), (123245, 170395)]