21278560

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7823}}^1$

素因数の和:7855

約数の個数: 48

約数和(自身を含む): 53234496

約数和(自身を除く): 31955936

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 340, 544, 680, 1360, 2720, 7823, 15646, 31292, 39115, 62584, 78230, 125168, 132991, 156460, 250336, 265982, 312920, 531964, 625840, 664955, 1063928, 1251680, 1329910, 2127856, 2659820, 4255712, 5319640, 10639280, 21278560]

約数ペア:

[(1, 21278560), (2, 10639280), (4, 5319640), (5, 4255712), (8, 2659820), (10, 2127856), (16, 1329910), (17, 1251680), (20, 1063928), (32, 664955), (34, 625840), (40, 531964), (68, 312920), (80, 265982), (85, 250336), (136, 156460), (160, 132991), (170, 125168), (272, 78230), (340, 62584), (544, 39115), (680, 31292), (1360, 15646), (2720, 7823)]