21817904

素因数分解:

$2^4\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{421}}^1$

素因数の和:549

約数の個数: 40

約数和(自身を含む): 43955520

約数和(自身を除く): 22137616

約数列:

[1, 2, 4, 8, 16, 41, 79, 82, 158, 164, 316, 328, 421, 632, 656, 842, 1264, 1684, 3239, 3368, 6478, 6736, 12956, 17261, 25912, 33259, 34522, 51824, 66518, 69044, 133036, 138088, 266072, 276176, 532144, 1363619, 2727238, 5454476, 10908952, 21817904]

約数ペア:

[(1, 21817904), (2, 10908952), (4, 5454476), (8, 2727238), (16, 1363619), (41, 532144), (79, 276176), (82, 266072), (158, 138088), (164, 133036), (316, 69044), (328, 66518), (421, 51824), (632, 34522), (656, 33259), (842, 25912), (1264, 17261), (1684, 12956), (3239, 6736), (3368, 6478)]