21717220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{2543}}^1$

素因数の和:2620

約数の個数: 48

約数和(自身を含む): 52996608

約数和(自身を除く): 31279388

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 61, 70, 122, 140, 244, 305, 427, 610, 854, 1220, 1708, 2135, 2543, 4270, 5086, 8540, 10172, 12715, 17801, 25430, 35602, 50860, 71204, 89005, 155123, 178010, 310246, 356020, 620492, 775615, 1085861, 1551230, 2171722, 3102460, 4343444, 5429305, 10858610, 21717220]

約数ペア:

[(1, 21717220), (2, 10858610), (4, 5429305), (5, 4343444), (7, 3102460), (10, 2171722), (14, 1551230), (20, 1085861), (28, 775615), (35, 620492), (61, 356020), (70, 310246), (122, 178010), (140, 155123), (244, 89005), (305, 71204), (427, 50860), (610, 35602), (854, 25430), (1220, 17801), (1708, 12715), (2135, 10172), (2543, 8540), (4270, 5086)]