21687420

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{181}}^1\times {\mathrm{1997}}^1$

素因数の和:2190

約数の個数: 48

約数和(自身を含む): 61090848

約数和(自身を除く): 39403428

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 181, 362, 543, 724, 905, 1086, 1810, 1997, 2172, 2715, 3620, 3994, 5430, 5991, 7988, 9985, 10860, 11982, 19970, 23964, 29955, 39940, 59910, 119820, 361457, 722914, 1084371, 1445828, 1807285, 2168742, 3614570, 4337484, 5421855, 7229140, 10843710, 21687420]

約数ペア:

[(1, 21687420), (2, 10843710), (3, 7229140), (4, 5421855), (5, 4337484), (6, 3614570), (10, 2168742), (12, 1807285), (15, 1445828), (20, 1084371), (30, 722914), (60, 361457), (181, 119820), (362, 59910), (543, 39940), (724, 29955), (905, 23964), (1086, 19970), (1810, 11982), (1997, 10860), (2172, 9985), (2715, 7988), (3620, 5991), (3994, 5430)]