19900890

素因数分解:

$2^1\times 3^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{311}}^1$

素因数の和:409

約数の個数: 80

約数和(自身を含む): 54362880

約数和(自身を除く): 34461990

約数列:

[1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 79, 81, 90, 135, 158, 162, 237, 270, 311, 395, 405, 474, 622, 711, 790, 810, 933, 1185, 1422, 1555, 1866, 2133, 2370, 2799, 3110, 3555, 4266, 4665, 5598, 6399, 7110, 8397, 9330, 10665, 12798, 13995, 16794, 21330, 24569, 25191, 27990, 31995, 41985, 49138, 50382, 63990, 73707, 83970, 122845, 125955, 147414, 221121, 245690, 251910, 368535, 442242, 663363, 737070, 1105605, 1326726, 1990089, 2211210, 3316815, 3980178, 6633630, 9950445, 19900890]

約数ペア:

[(1, 19900890), (2, 9950445), (3, 6633630), (5, 3980178), (6, 3316815), (9, 2211210), (10, 1990089), (15, 1326726), (18, 1105605), (27, 737070), (30, 663363), (45, 442242), (54, 368535), (79, 251910), (81, 245690), (90, 221121), (135, 147414), (158, 125955), (162, 122845), (237, 83970), (270, 73707), (311, 63990), (395, 50382), (405, 49138), (474, 41985), (622, 31995), (711, 27990), (790, 25191), (810, 24569), (933, 21330), (1185, 16794), (1422, 13995), (1555, 12798), (1866, 10665), (2133, 9330), (2370, 8397), (2799, 7110), (3110, 6399), (3555, 5598), (4266, 4665)]