20721645

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{419}}^1$

素因数の和:594

約数の個数: 48

約数和(自身を含む): 41408640

約数和(自身を除く): 20686995

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 157, 315, 419, 471, 785, 1099, 1257, 1413, 2095, 2355, 2933, 3297, 3771, 5495, 6285, 7065, 8799, 9891, 14665, 16485, 18855, 26397, 43995, 49455, 65783, 131985, 197349, 328915, 460481, 592047, 986745, 1381443, 2302405, 2960235, 4144329, 6907215, 20721645]

約数ペア:

[(1, 20721645), (3, 6907215), (5, 4144329), (7, 2960235), (9, 2302405), (15, 1381443), (21, 986745), (35, 592047), (45, 460481), (63, 328915), (105, 197349), (157, 131985), (315, 65783), (419, 49455), (471, 43995), (785, 26397), (1099, 18855), (1257, 16485), (1413, 14665), (2095, 9891), (2355, 8799), (2933, 7065), (3297, 6285), (3771, 5495)]