21444520

素因数分解:

$2^3\times 5^1\times {\mathrm{653}}^1\times {\mathrm{821}}^1$

素因数の和:1485

約数の個数: 32

約数和(自身を含む): 48382920

約数和(自身を除く): 26938400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 653, 821, 1306, 1642, 2612, 3265, 3284, 4105, 5224, 6530, 6568, 8210, 13060, 16420, 26120, 32840, 536113, 1072226, 2144452, 2680565, 4288904, 5361130, 10722260, 21444520]

約数ペア:

[(1, 21444520), (2, 10722260), (4, 5361130), (5, 4288904), (8, 2680565), (10, 2144452), (20, 1072226), (40, 536113), (653, 32840), (821, 26120), (1306, 16420), (1642, 13060), (2612, 8210), (3265, 6568), (3284, 6530), (4105, 5224)]