21128144

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{173}}^1\times {\mathrm{449}}^1$

素因数の和:647

約数の個数: 40

約数和(自身を含む): 43691400

約数和(自身を除く): 22563256

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 173, 272, 346, 449, 692, 898, 1384, 1796, 2768, 2941, 3592, 5882, 7184, 7633, 11764, 15266, 23528, 30532, 47056, 61064, 77677, 122128, 155354, 310708, 621416, 1242832, 1320509, 2641018, 5282036, 10564072, 21128144]

約数ペア:

[(1, 21128144), (2, 10564072), (4, 5282036), (8, 2641018), (16, 1320509), (17, 1242832), (34, 621416), (68, 310708), (136, 155354), (173, 122128), (272, 77677), (346, 61064), (449, 47056), (692, 30532), (898, 23528), (1384, 15266), (1796, 11764), (2768, 7633), (2941, 7184), (3592, 5882)]