21120729

素因数分解:

$3^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{439}}^1$

素因数の和:557

約数の個数: 32

約数和(自身を含む): 33792000

約数和(自身を除く): 12671271

約数列:

[1, 3, 7, 21, 29, 79, 87, 203, 237, 439, 553, 609, 1317, 1659, 2291, 3073, 6873, 9219, 12731, 16037, 34681, 38193, 48111, 89117, 104043, 242767, 267351, 728301, 1005749, 3017247, 7040243, 21120729]

約数ペア:

[(1, 21120729), (3, 7040243), (7, 3017247), (21, 1005749), (29, 728301), (79, 267351), (87, 242767), (203, 104043), (237, 89117), (439, 48111), (553, 38193), (609, 34681), (1317, 16037), (1659, 12731), (2291, 9219), (3073, 6873)]