20973897

素因数分解:

$3^4\times 7^1\times {\mathrm{71}}^1\times {\mathrm{521}}^1$

素因数の和:611

約数の個数: 40

約数和(自身を含む): 36381312

約数和(自身を除く): 15407415

約数列:

[1, 3, 7, 9, 21, 27, 63, 71, 81, 189, 213, 497, 521, 567, 639, 1491, 1563, 1917, 3647, 4473, 4689, 5751, 10941, 13419, 14067, 32823, 36991, 40257, 42201, 98469, 110973, 258937, 295407, 332919, 776811, 998757, 2330433, 2996271, 6991299, 20973897]

約数ペア:

[(1, 20973897), (3, 6991299), (7, 2996271), (9, 2330433), (21, 998757), (27, 776811), (63, 332919), (71, 295407), (81, 258937), (189, 110973), (213, 98469), (497, 42201), (521, 40257), (567, 36991), (639, 32823), (1491, 14067), (1563, 13419), (1917, 10941), (3647, 5751), (4473, 4689)]