21490425

素因数分解:

$3^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{457}}^1$

素因数の和:503

約数の個数: 72

約数和(自身を含む): 44297760

約数和(自身を除く): 22807335

約数列:

[1, 3, 5, 9, 11, 15, 19, 25, 33, 45, 55, 57, 75, 95, 99, 165, 171, 209, 225, 275, 285, 457, 475, 495, 627, 825, 855, 1045, 1371, 1425, 1881, 2285, 2475, 3135, 4113, 4275, 5027, 5225, 6855, 8683, 9405, 11425, 15081, 15675, 20565, 25135, 26049, 34275, 43415, 45243, 47025, 75405, 78147, 95513, 102825, 125675, 130245, 217075, 226215, 286539, 377025, 390735, 477565, 651225, 859617, 1131075, 1432695, 1953675, 2387825, 4298085, 7163475, 21490425]

約数ペア:

[(1, 21490425), (3, 7163475), (5, 4298085), (9, 2387825), (11, 1953675), (15, 1432695), (19, 1131075), (25, 859617), (33, 651225), (45, 477565), (55, 390735), (57, 377025), (75, 286539), (95, 226215), (99, 217075), (165, 130245), (171, 125675), (209, 102825), (225, 95513), (275, 78147), (285, 75405), (457, 47025), (475, 45243), (495, 43415), (627, 34275), (825, 26049), (855, 25135), (1045, 20565), (1371, 15675), (1425, 15081), (1881, 11425), (2285, 9405), (2475, 8683), (3135, 6855), (4113, 5225), (4275, 5027)]