21484720

素因数分解:

$2^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{2659}}^1$

素因数の和:2773

約数の個数: 40

約数和(自身を含む): 50465520

約数和(自身を除く): 28980800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 101, 202, 404, 505, 808, 1010, 1616, 2020, 2659, 4040, 5318, 8080, 10636, 13295, 21272, 26590, 42544, 53180, 106360, 212720, 268559, 537118, 1074236, 1342795, 2148472, 2685590, 4296944, 5371180, 10742360, 21484720]

約数ペア:

[(1, 21484720), (2, 10742360), (4, 5371180), (5, 4296944), (8, 2685590), (10, 2148472), (16, 1342795), (20, 1074236), (40, 537118), (80, 268559), (101, 212720), (202, 106360), (404, 53180), (505, 42544), (808, 26590), (1010, 21272), (1616, 13295), (2020, 10636), (2659, 8080), (4040, 5318)]