21615808

素因数分解:

$2^6\times {\mathrm{67}}^1\times {\mathrm{71}}^2$

素因数の和:221

約数の個数: 42

約数和(自身を含む): 44155868

約数和(自身を除く): 22540060

約数列:

[1, 2, 4, 8, 16, 32, 64, 67, 71, 134, 142, 268, 284, 536, 568, 1072, 1136, 2144, 2272, 4288, 4544, 4757, 5041, 9514, 10082, 19028, 20164, 38056, 40328, 76112, 80656, 152224, 161312, 304448, 322624, 337747, 675494, 1350988, 2701976, 5403952, 10807904, 21615808]

約数ペア:

[(1, 21615808), (2, 10807904), (4, 5403952), (8, 2701976), (16, 1350988), (32, 675494), (64, 337747), (67, 322624), (71, 304448), (134, 161312), (142, 152224), (268, 80656), (284, 76112), (536, 40328), (568, 38056), (1072, 20164), (1136, 19028), (2144, 10082), (2272, 9514), (4288, 5041), (4544, 4757)]