220720

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1$

素因数の和:133

約数の個数: 40

約数和(自身を含む): 535680

約数和(自身を除く): 314960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 89, 124, 155, 178, 248, 310, 356, 445, 496, 620, 712, 890, 1240, 1424, 1780, 2480, 2759, 3560, 5518, 7120, 11036, 13795, 22072, 27590, 44144, 55180, 110360, 220720]

約数ペア:

[(1, 220720), (2, 110360), (4, 55180), (5, 44144), (8, 27590), (10, 22072), (16, 13795), (20, 11036), (31, 7120), (40, 5518), (62, 3560), (80, 2759), (89, 2480), (124, 1780), (155, 1424), (178, 1240), (248, 890), (310, 712), (356, 620), (445, 496)]