21251920

素因数分解:

$2^4\times 5^1\times {\mathrm{211}}^1\times {\mathrm{1259}}^1$

素因数の和:1483

約数の個数: 40

約数和(自身を含む): 49684320

約数和(自身を除く): 28432400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 211, 422, 844, 1055, 1259, 1688, 2110, 2518, 3376, 4220, 5036, 6295, 8440, 10072, 12590, 16880, 20144, 25180, 50360, 100720, 265649, 531298, 1062596, 1328245, 2125192, 2656490, 4250384, 5312980, 10625960, 21251920]

約数ペア:

[(1, 21251920), (2, 10625960), (4, 5312980), (5, 4250384), (8, 2656490), (10, 2125192), (16, 1328245), (20, 1062596), (40, 531298), (80, 265649), (211, 100720), (422, 50360), (844, 25180), (1055, 20144), (1259, 16880), (1688, 12590), (2110, 10072), (2518, 8440), (3376, 6295), (4220, 5036)]