21078920

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12853}}^1$

素因数の和:12905

約数の個数: 32

約数和(自身を含む): 48588120

約数和(自身を除く): 27509200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12853, 25706, 51412, 64265, 102824, 128530, 257060, 514120, 526973, 1053946, 2107892, 2634865, 4215784, 5269730, 10539460, 21078920]

約数ペア:

[(1, 21078920), (2, 10539460), (4, 5269730), (5, 4215784), (8, 2634865), (10, 2107892), (20, 1053946), (40, 526973), (41, 514120), (82, 257060), (164, 128530), (205, 102824), (328, 64265), (410, 51412), (820, 25706), (1640, 12853)]