21515920

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4409}}^1$

素因数の和:4483

約数の個数: 40

約数和(自身を含む): 50856120

約数和(自身を除く): 29340200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4409, 4880, 8818, 17636, 22045, 35272, 44090, 70544, 88180, 176360, 268949, 352720, 537898, 1075796, 1344745, 2151592, 2689490, 4303184, 5378980, 10757960, 21515920]

約数ペア:

[(1, 21515920), (2, 10757960), (4, 5378980), (5, 4303184), (8, 2689490), (10, 2151592), (16, 1344745), (20, 1075796), (40, 537898), (61, 352720), (80, 268949), (122, 176360), (244, 88180), (305, 70544), (488, 44090), (610, 35272), (976, 22045), (1220, 17636), (2440, 8818), (4409, 4880)]