21109904

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{503}}^1$

素因数の和:615

約数の個数: 40

約数和(自身を含む): 42622272

約数和(自身を除く): 21512368

約数列:

[1, 2, 4, 8, 16, 43, 61, 86, 122, 172, 244, 344, 488, 503, 688, 976, 1006, 2012, 2623, 4024, 5246, 8048, 10492, 20984, 21629, 30683, 41968, 43258, 61366, 86516, 122732, 173032, 245464, 346064, 490928, 1319369, 2638738, 5277476, 10554952, 21109904]

約数ペア:

[(1, 21109904), (2, 10554952), (4, 5277476), (8, 2638738), (16, 1319369), (43, 490928), (61, 346064), (86, 245464), (122, 173032), (172, 122732), (244, 86516), (344, 61366), (488, 43258), (503, 41968), (688, 30683), (976, 21629), (1006, 20984), (2012, 10492), (2623, 8048), (4024, 5246)]