21999020

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{727}}^1$

素因数の和:842

約数の個数: 48

約数和(自身を含む): 49533120

約数和(自身を除く): 27534100

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 89, 170, 178, 340, 356, 445, 727, 890, 1454, 1513, 1780, 2908, 3026, 3635, 6052, 7270, 7565, 12359, 14540, 15130, 24718, 30260, 49436, 61795, 64703, 123590, 129406, 247180, 258812, 323515, 647030, 1099951, 1294060, 2199902, 4399804, 5499755, 10999510, 21999020]

約数ペア:

[(1, 21999020), (2, 10999510), (4, 5499755), (5, 4399804), (10, 2199902), (17, 1294060), (20, 1099951), (34, 647030), (68, 323515), (85, 258812), (89, 247180), (170, 129406), (178, 123590), (340, 64703), (356, 61795), (445, 49436), (727, 30260), (890, 24718), (1454, 15130), (1513, 14540), (1780, 12359), (2908, 7565), (3026, 7270), (3635, 6052)]