21516440

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{619}}^1$

素因数の和:720

約数の個数: 64

約数和(自身を含む): 53568000

約数和(自身を除く): 32051560

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 79, 88, 110, 158, 220, 316, 395, 440, 619, 632, 790, 869, 1238, 1580, 1738, 2476, 3095, 3160, 3476, 4345, 4952, 6190, 6809, 6952, 8690, 12380, 13618, 17380, 24760, 27236, 34045, 34760, 48901, 54472, 68090, 97802, 136180, 195604, 244505, 272360, 391208, 489010, 537911, 978020, 1075822, 1956040, 2151644, 2689555, 4303288, 5379110, 10758220, 21516440]

約数ペア:

[(1, 21516440), (2, 10758220), (4, 5379110), (5, 4303288), (8, 2689555), (10, 2151644), (11, 1956040), (20, 1075822), (22, 978020), (40, 537911), (44, 489010), (55, 391208), (79, 272360), (88, 244505), (110, 195604), (158, 136180), (220, 97802), (316, 68090), (395, 54472), (440, 48901), (619, 34760), (632, 34045), (790, 27236), (869, 24760), (1238, 17380), (1580, 13618), (1738, 12380), (2476, 8690), (3095, 6952), (3160, 6809), (3476, 6190), (4345, 4952)]