21005013

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{409}}^1$

素因数の和:501

約数の個数: 32

約数和(自身を含む): 31881600

約数和(自身を除く): 10876587

約数列:

[1, 3, 17, 19, 51, 53, 57, 159, 323, 409, 901, 969, 1007, 1227, 2703, 3021, 6953, 7771, 17119, 20859, 21677, 23313, 51357, 65031, 132107, 368509, 396321, 411863, 1105527, 1235589, 7001671, 21005013]

約数ペア:

[(1, 21005013), (3, 7001671), (17, 1235589), (19, 1105527), (51, 411863), (53, 396321), (57, 368509), (159, 132107), (323, 65031), (409, 51357), (901, 23313), (969, 21677), (1007, 20859), (1227, 17119), (2703, 7771), (3021, 6953)]