21118120

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{751}}^1$

素因数の和:818

約数の個数: 64

約数和(自身を含む): 51436800

約数和(自身を除く): 30318680

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 37, 38, 40, 74, 76, 95, 148, 152, 185, 190, 296, 370, 380, 703, 740, 751, 760, 1406, 1480, 1502, 2812, 3004, 3515, 3755, 5624, 6008, 7030, 7510, 14060, 14269, 15020, 27787, 28120, 28538, 30040, 55574, 57076, 71345, 111148, 114152, 138935, 142690, 222296, 277870, 285380, 527953, 555740, 570760, 1055906, 1111480, 2111812, 2639765, 4223624, 5279530, 10559060, 21118120]

約数ペア:

[(1, 21118120), (2, 10559060), (4, 5279530), (5, 4223624), (8, 2639765), (10, 2111812), (19, 1111480), (20, 1055906), (37, 570760), (38, 555740), (40, 527953), (74, 285380), (76, 277870), (95, 222296), (148, 142690), (152, 138935), (185, 114152), (190, 111148), (296, 71345), (370, 57076), (380, 55574), (703, 30040), (740, 28538), (751, 28120), (760, 27787), (1406, 15020), (1480, 14269), (1502, 14060), (2812, 7510), (3004, 7030), (3515, 6008), (3755, 5624)]