640220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{269}}^1$

素因数の和:302

約数の個数: 48

約数和(自身を含む): 1632960

約数和(自身を除く): 992740

約数列:

[1, 2, 4, 5, 7, 10, 14, 17, 20, 28, 34, 35, 68, 70, 85, 119, 140, 170, 238, 269, 340, 476, 538, 595, 1076, 1190, 1345, 1883, 2380, 2690, 3766, 4573, 5380, 7532, 9146, 9415, 18292, 18830, 22865, 32011, 37660, 45730, 64022, 91460, 128044, 160055, 320110, 640220]

約数ペア:

[(1, 640220), (2, 320110), (4, 160055), (5, 128044), (7, 91460), (10, 64022), (14, 45730), (17, 37660), (20, 32011), (28, 22865), (34, 18830), (35, 18292), (68, 9415), (70, 9146), (85, 7532), (119, 5380), (140, 4573), (170, 3766), (238, 2690), (269, 2380), (340, 1883), (476, 1345), (538, 1190), (595, 1076)]