21284360

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{1301}}^1$

素因数の和:1721

約数の個数: 32

約数和(自身を含む): 48043800

約数和(自身を除く): 26759440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1301, 1636, 2045, 2602, 3272, 4090, 5204, 6505, 8180, 10408, 13010, 16360, 26020, 52040, 532109, 1064218, 2128436, 2660545, 4256872, 5321090, 10642180, 21284360]

約数ペア:

[(1, 21284360), (2, 10642180), (4, 5321090), (5, 4256872), (8, 2660545), (10, 2128436), (20, 1064218), (40, 532109), (409, 52040), (818, 26020), (1301, 16360), (1636, 13010), (2045, 10408), (2602, 8180), (3272, 6505), (4090, 5204)]