21468980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{1163}}^1$

素因数の和:1256

約数の個数: 48

約数和(自身を含む): 49279104

約数和(自身を除く): 27810124

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 71, 130, 142, 260, 284, 355, 710, 923, 1163, 1420, 1846, 2326, 3692, 4615, 4652, 5815, 9230, 11630, 15119, 18460, 23260, 30238, 60476, 75595, 82573, 151190, 165146, 302380, 330292, 412865, 825730, 1073449, 1651460, 2146898, 4293796, 5367245, 10734490, 21468980]

約数ペア:

[(1, 21468980), (2, 10734490), (4, 5367245), (5, 4293796), (10, 2146898), (13, 1651460), (20, 1073449), (26, 825730), (52, 412865), (65, 330292), (71, 302380), (130, 165146), (142, 151190), (260, 82573), (284, 75595), (355, 60476), (710, 30238), (923, 23260), (1163, 18460), (1420, 15119), (1846, 11630), (2326, 9230), (3692, 5815), (4615, 4652)]