21445720

素因数分解:

$2^3\times 5^1\times {\mathrm{461}}^1\times {\mathrm{1163}}^1$

素因数の和:1635

約数の個数: 32

約数和(自身を含む): 48399120

約数和(自身を除く): 26953400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 461, 922, 1163, 1844, 2305, 2326, 3688, 4610, 4652, 5815, 9220, 9304, 11630, 18440, 23260, 46520, 536143, 1072286, 2144572, 2680715, 4289144, 5361430, 10722860, 21445720]

約数ペア:

[(1, 21445720), (2, 10722860), (4, 5361430), (5, 4289144), (8, 2680715), (10, 2144572), (20, 1072286), (40, 536143), (461, 46520), (922, 23260), (1163, 18440), (1844, 11630), (2305, 9304), (2326, 9220), (3688, 5815), (4610, 4652)]