20316920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{439}}^1$

素因数の和:552

約数の個数: 64

約数和(自身を含む): 49896000

約数和(自身を除く): 29579080

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 89, 104, 130, 178, 260, 356, 439, 445, 520, 712, 878, 890, 1157, 1756, 1780, 2195, 2314, 3512, 3560, 4390, 4628, 5707, 5785, 8780, 9256, 11414, 11570, 17560, 22828, 23140, 28535, 39071, 45656, 46280, 57070, 78142, 114140, 156284, 195355, 228280, 312568, 390710, 507923, 781420, 1015846, 1562840, 2031692, 2539615, 4063384, 5079230, 10158460, 20316920]

約数ペア:

[(1, 20316920), (2, 10158460), (4, 5079230), (5, 4063384), (8, 2539615), (10, 2031692), (13, 1562840), (20, 1015846), (26, 781420), (40, 507923), (52, 390710), (65, 312568), (89, 228280), (104, 195355), (130, 156284), (178, 114140), (260, 78142), (356, 57070), (439, 46280), (445, 45656), (520, 39071), (712, 28535), (878, 23140), (890, 22828), (1157, 17560), (1756, 11570), (1780, 11414), (2195, 9256), (2314, 8780), (3512, 5785), (3560, 5707), (4390, 4628)]