21920720

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8839}}^1$

素因数の和:8883

約数の個数: 40

約数和(自身を含む): 52615680

約数和(自身を除く): 30694960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8839, 17678, 35356, 44195, 70712, 88390, 141424, 176780, 274009, 353560, 548018, 707120, 1096036, 1370045, 2192072, 2740090, 4384144, 5480180, 10960360, 21920720]

約数ペア:

[(1, 21920720), (2, 10960360), (4, 5480180), (5, 4384144), (8, 2740090), (10, 2192072), (16, 1370045), (20, 1096036), (31, 707120), (40, 548018), (62, 353560), (80, 274009), (124, 176780), (155, 141424), (248, 88390), (310, 70712), (496, 44195), (620, 35356), (1240, 17678), (2480, 8839)]