21805980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{7417}}^1$

素因数の和:7443

約数の個数: 72

約数和(自身を含む): 71034768

約数和(自身を除く): 49228788

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 420, 490, 588, 735, 980, 1470, 2940, 7417, 14834, 22251, 29668, 37085, 44502, 51919, 74170, 89004, 103838, 111255, 148340, 155757, 207676, 222510, 259595, 311514, 363433, 445020, 519190, 623028, 726866, 778785, 1038380, 1090299, 1453732, 1557570, 1817165, 2180598, 3115140, 3634330, 4361196, 5451495, 7268660, 10902990, 21805980]

約数ペア:

[(1, 21805980), (2, 10902990), (3, 7268660), (4, 5451495), (5, 4361196), (6, 3634330), (7, 3115140), (10, 2180598), (12, 1817165), (14, 1557570), (15, 1453732), (20, 1090299), (21, 1038380), (28, 778785), (30, 726866), (35, 623028), (42, 519190), (49, 445020), (60, 363433), (70, 311514), (84, 259595), (98, 222510), (105, 207676), (140, 155757), (147, 148340), (196, 111255), (210, 103838), (245, 89004), (294, 74170), (420, 51919), (490, 44502), (588, 37085), (735, 29668), (980, 22251), (1470, 14834), (2940, 7417)]