21072381

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{59}}^1\times {\mathrm{79}}^1\times {\mathrm{137}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 31795200

約数和(自身を除く): 10722819

約数列:

[1, 3, 11, 33, 59, 79, 137, 177, 237, 411, 649, 869, 1507, 1947, 2607, 4521, 4661, 8083, 10823, 13983, 24249, 32469, 51271, 88913, 119053, 153813, 266739, 357159, 638557, 1915671, 7024127, 21072381]

約数ペア:

[(1, 21072381), (3, 7024127), (11, 1915671), (33, 638557), (59, 357159), (79, 266739), (137, 153813), (177, 119053), (237, 88913), (411, 51271), (649, 32469), (869, 24249), (1507, 13983), (1947, 10823), (2607, 8083), (4521, 4661)]