21023955

素因数分解:

$3^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1$

素因数の和:138

約数の個数: 80

約数和(自身を含む): 41050944

約数和(自身を除く): 20026989

約数列:

[1, 3, 5, 9, 15, 23, 27, 37, 45, 61, 69, 81, 111, 115, 135, 183, 185, 207, 305, 333, 345, 405, 549, 555, 621, 851, 915, 999, 1035, 1403, 1647, 1665, 1863, 2257, 2553, 2745, 2997, 3105, 4209, 4255, 4941, 4995, 6771, 7015, 7659, 8235, 9315, 11285, 12627, 12765, 14985, 20313, 21045, 22977, 24705, 33855, 37881, 38295, 51911, 60939, 63135, 68931, 101565, 113643, 114885, 155733, 182817, 189405, 259555, 304695, 344655, 467199, 568215, 778665, 914085, 1401597, 2335995, 4204791, 7007985, 21023955]

約数ペア:

[(1, 21023955), (3, 7007985), (5, 4204791), (9, 2335995), (15, 1401597), (23, 914085), (27, 778665), (37, 568215), (45, 467199), (61, 344655), (69, 304695), (81, 259555), (111, 189405), (115, 182817), (135, 155733), (183, 114885), (185, 113643), (207, 101565), (305, 68931), (333, 63135), (345, 60939), (405, 51911), (549, 38295), (555, 37881), (621, 33855), (851, 24705), (915, 22977), (999, 21045), (1035, 20313), (1403, 14985), (1647, 12765), (1665, 12627), (1863, 11285), (2257, 9315), (2553, 8235), (2745, 7659), (2997, 7015), (3105, 6771), (4209, 4995), (4255, 4941)]