20705840

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4243}}^1$

素因数の和:4317

約数の個数: 40

約数和(自身を含む): 48941808

約数和(自身を除く): 28235968

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4243, 4880, 8486, 16972, 21215, 33944, 42430, 67888, 84860, 169720, 258823, 339440, 517646, 1035292, 1294115, 2070584, 2588230, 4141168, 5176460, 10352920, 20705840]

約数ペア:

[(1, 20705840), (2, 10352920), (4, 5176460), (5, 4141168), (8, 2588230), (10, 2070584), (16, 1294115), (20, 1035292), (40, 517646), (61, 339440), (80, 258823), (122, 169720), (244, 84860), (305, 67888), (488, 42430), (610, 33944), (976, 21215), (1220, 16972), (2440, 8486), (4243, 4880)]