21067475

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{83}}^1$

素因数の和:188

約数の個数: 48

約数和(自身を含む): 31497984

約数和(自身を除く): 10430509

約数列:

[1, 5, 11, 13, 25, 55, 65, 71, 83, 143, 275, 325, 355, 415, 715, 781, 913, 923, 1079, 1775, 2075, 3575, 3905, 4565, 4615, 5395, 5893, 10153, 11869, 19525, 22825, 23075, 26975, 29465, 50765, 59345, 64823, 76609, 147325, 253825, 296725, 324115, 383045, 842699, 1620575, 1915225, 4213495, 21067475]

約数ペア:

[(1, 21067475), (5, 4213495), (11, 1915225), (13, 1620575), (25, 842699), (55, 383045), (65, 324115), (71, 296725), (83, 253825), (143, 147325), (275, 76609), (325, 64823), (355, 59345), (415, 50765), (715, 29465), (781, 26975), (913, 23075), (923, 22825), (1079, 19525), (1775, 11869), (2075, 10153), (3575, 5893), (3905, 5395), (4565, 4615)]