21000887975

素因数分解:

$5^2\times {\mathrm{79}}^1\times {\mathrm{139}}^1\times {\mathrm{227}}^1\times {\mathrm{337}}^1$

素因数の和:792

約数の個数: 48

約数和(自身を含む): 26756620800

約数和(自身を除く): 5755732825

約数列:

[1, 5, 25, 79, 139, 227, 337, 395, 695, 1135, 1685, 1975, 3475, 5675, 8425, 10981, 17933, 26623, 31553, 46843, 54905, 76499, 89665, 133115, 157765, 234215, 274525, 382495, 448325, 665575, 788825, 1171075, 1912475, 2492687, 3700597, 6043421, 10633361, 12463435, 18502985, 30217105, 53166805, 62317175, 92514925, 151085525, 265834025, 840035519, 4200177595, 21000887975]

約数ペア:

[(1, 21000887975), (5, 4200177595), (25, 840035519), (79, 265834025), (139, 151085525), (227, 92514925), (337, 62317175), (395, 53166805), (695, 30217105), (1135, 18502985), (1685, 12463435), (1975, 10633361), (3475, 6043421), (5675, 3700597), (8425, 2492687), (10981, 1912475), (17933, 1171075), (26623, 788825), (31553, 665575), (46843, 448325), (54905, 382495), (76499, 274525), (89665, 234215), (133115, 157765)]