81649720

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{109}}^1\times {\mathrm{307}}^1$

素因数の和:488

約数の個数: 64

約数和(自身を含む): 189050400

約数和(自身を除く): 107400680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 109, 122, 218, 244, 305, 307, 436, 488, 545, 610, 614, 872, 1090, 1220, 1228, 1535, 2180, 2440, 2456, 3070, 4360, 6140, 6649, 12280, 13298, 18727, 26596, 33245, 33463, 37454, 53192, 66490, 66926, 74908, 93635, 132980, 133852, 149816, 167315, 187270, 265960, 267704, 334630, 374540, 669260, 749080, 1338520, 2041243, 4082486, 8164972, 10206215, 16329944, 20412430, 40824860, 81649720]

約数ペア:

[(1, 81649720), (2, 40824860), (4, 20412430), (5, 16329944), (8, 10206215), (10, 8164972), (20, 4082486), (40, 2041243), (61, 1338520), (109, 749080), (122, 669260), (218, 374540), (244, 334630), (305, 267704), (307, 265960), (436, 187270), (488, 167315), (545, 149816), (610, 133852), (614, 132980), (872, 93635), (1090, 74908), (1220, 66926), (1228, 66490), (1535, 53192), (2180, 37454), (2440, 33463), (2456, 33245), (3070, 26596), (4360, 18727), (6140, 13298), (6649, 12280)]