21155656

素因数分解:

$2^3\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{691}}^1$

素因数の和:829

約数の個数: 32

約数和(自身を含む): 41104800

約数和(自身を除く): 19949144

約数列:

[1, 2, 4, 8, 43, 86, 89, 172, 178, 344, 356, 691, 712, 1382, 2764, 3827, 5528, 7654, 15308, 29713, 30616, 59426, 61499, 118852, 122998, 237704, 245996, 491992, 2644457, 5288914, 10577828, 21155656]

約数ペア:

[(1, 21155656), (2, 10577828), (4, 5288914), (8, 2644457), (43, 491992), (86, 245996), (89, 237704), (172, 122998), (178, 118852), (344, 61499), (356, 59426), (691, 30616), (712, 29713), (1382, 15308), (2764, 7654), (3827, 5528)]