21145455

素因数分解:

$3^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{479}}^1$

素因数の和:605

約数の個数: 40

約数和(自身を含む): 38332800

約数和(自身を除く): 17187345

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 109, 135, 327, 405, 479, 545, 981, 1437, 1635, 2395, 2943, 4311, 4905, 7185, 8829, 12933, 14715, 21555, 38799, 44145, 52211, 64665, 156633, 193995, 261055, 469899, 783165, 1409697, 2349495, 4229091, 7048485, 21145455]

約数ペア:

[(1, 21145455), (3, 7048485), (5, 4229091), (9, 2349495), (15, 1409697), (27, 783165), (45, 469899), (81, 261055), (109, 193995), (135, 156633), (327, 64665), (405, 52211), (479, 44145), (545, 38799), (981, 21555), (1437, 14715), (1635, 12933), (2395, 8829), (2943, 7185), (4311, 4905)]