21486440

素因数分解:

$2^3\times 5^1\times {\mathrm{487}}^1\times {\mathrm{1103}}^1$

素因数の和:1601

約数の個数: 32

約数和(自身を含む): 48487680

約数和(自身を除く): 27001240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 487, 974, 1103, 1948, 2206, 2435, 3896, 4412, 4870, 5515, 8824, 9740, 11030, 19480, 22060, 44120, 537161, 1074322, 2148644, 2685805, 4297288, 5371610, 10743220, 21486440]

約数ペア:

[(1, 21486440), (2, 10743220), (4, 5371610), (5, 4297288), (8, 2685805), (10, 2148644), (20, 1074322), (40, 537161), (487, 44120), (974, 22060), (1103, 19480), (1948, 11030), (2206, 9740), (2435, 8824), (3896, 5515), (4412, 4870)]