20717775

素因数分解:

$3^4\times 5^2\times {\mathrm{13}}^1\times {\mathrm{787}}^1$

素因数の和:822

約数の個数: 60

約数和(自身を含む): 41381032

約数和(自身を除く): 20663257

約数列:

[1, 3, 5, 9, 13, 15, 25, 27, 39, 45, 65, 75, 81, 117, 135, 195, 225, 325, 351, 405, 585, 675, 787, 975, 1053, 1755, 2025, 2361, 2925, 3935, 5265, 7083, 8775, 10231, 11805, 19675, 21249, 26325, 30693, 35415, 51155, 59025, 63747, 92079, 106245, 153465, 177075, 255775, 276237, 318735, 460395, 531225, 767325, 828711, 1381185, 1593675, 2301975, 4143555, 6905925, 20717775]

約数ペア:

[(1, 20717775), (3, 6905925), (5, 4143555), (9, 2301975), (13, 1593675), (15, 1381185), (25, 828711), (27, 767325), (39, 531225), (45, 460395), (65, 318735), (75, 276237), (81, 255775), (117, 177075), (135, 153465), (195, 106245), (225, 92079), (325, 63747), (351, 59025), (405, 51155), (585, 35415), (675, 30693), (787, 26325), (975, 21249), (1053, 19675), (1755, 11805), (2025, 10231), (2361, 8775), (2925, 7083), (3935, 5265)]