20921175

素因数分解:

$3^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{107}}^1$

素因数の和:213

約数の個数: 72

約数和(自身を含む): 41783040

約数和(自身を除く): 20861865

約数列:

[1, 3, 5, 9, 11, 15, 25, 33, 45, 55, 75, 79, 99, 107, 165, 225, 237, 275, 321, 395, 495, 535, 711, 825, 869, 963, 1177, 1185, 1605, 1975, 2475, 2607, 2675, 3531, 3555, 4345, 4815, 5885, 5925, 7821, 8025, 8453, 10593, 13035, 17655, 17775, 21725, 24075, 25359, 29425, 39105, 42265, 52965, 65175, 76077, 88275, 92983, 126795, 195525, 211325, 264825, 278949, 380385, 464915, 633975, 836847, 1394745, 1901925, 2324575, 4184235, 6973725, 20921175]

約数ペア:

[(1, 20921175), (3, 6973725), (5, 4184235), (9, 2324575), (11, 1901925), (15, 1394745), (25, 836847), (33, 633975), (45, 464915), (55, 380385), (75, 278949), (79, 264825), (99, 211325), (107, 195525), (165, 126795), (225, 92983), (237, 88275), (275, 76077), (321, 65175), (395, 52965), (495, 42265), (535, 39105), (711, 29425), (825, 25359), (869, 24075), (963, 21725), (1177, 17775), (1185, 17655), (1605, 13035), (1975, 10593), (2475, 8453), (2607, 8025), (2675, 7821), (3531, 5925), (3555, 5885), (4345, 4815)]