21050240

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1061}}^1$

素因数の和:1111

約数の個数: 64

約数和(自身を含む): 51995520

約数和(自身を除く): 30945280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1061, 1240, 1984, 2122, 2480, 3968, 4244, 4960, 5305, 8488, 9920, 10610, 16976, 19840, 21220, 32891, 33952, 42440, 65782, 67904, 84880, 131564, 135808, 164455, 169760, 263128, 328910, 339520, 526256, 657820, 679040, 1052512, 1315640, 2105024, 2631280, 4210048, 5262560, 10525120, 21050240]

約数ペア:

[(1, 21050240), (2, 10525120), (4, 5262560), (5, 4210048), (8, 2631280), (10, 2105024), (16, 1315640), (20, 1052512), (31, 679040), (32, 657820), (40, 526256), (62, 339520), (64, 328910), (80, 263128), (124, 169760), (128, 164455), (155, 135808), (160, 131564), (248, 84880), (310, 67904), (320, 65782), (496, 42440), (620, 33952), (640, 32891), (992, 21220), (1061, 19840), (1240, 16976), (1984, 10610), (2122, 9920), (2480, 8488), (3968, 5305), (4244, 4960)]