21157850

素因数分解:

$2^1\times 5^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{991}}^1$

素因数の和:1071

約数の個数: 48

約数和(自身を含む): 45758976

約数和(自身を除く): 24601126

約数列:

[1, 2, 5, 7, 10, 14, 25, 35, 50, 61, 70, 122, 175, 305, 350, 427, 610, 854, 991, 1525, 1982, 2135, 3050, 4270, 4955, 6937, 9910, 10675, 13874, 21350, 24775, 34685, 49550, 60451, 69370, 120902, 173425, 302255, 346850, 423157, 604510, 846314, 1511275, 2115785, 3022550, 4231570, 10578925, 21157850]

約数ペア:

[(1, 21157850), (2, 10578925), (5, 4231570), (7, 3022550), (10, 2115785), (14, 1511275), (25, 846314), (35, 604510), (50, 423157), (61, 346850), (70, 302255), (122, 173425), (175, 120902), (305, 69370), (350, 60451), (427, 49550), (610, 34685), (854, 24775), (991, 21350), (1525, 13874), (1982, 10675), (2135, 9910), (3050, 6937), (4270, 4955)]