20318800

素因数分解:

$2^4\times 5^2\times {\mathrm{79}}^1\times {\mathrm{643}}^1$

素因数の和:740

約数の個数: 60

約数和(自身を含む): 49510720

約数和(自身を除く): 29191920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 79, 80, 100, 158, 200, 316, 395, 400, 632, 643, 790, 1264, 1286, 1580, 1975, 2572, 3160, 3215, 3950, 5144, 6320, 6430, 7900, 10288, 12860, 15800, 16075, 25720, 31600, 32150, 50797, 51440, 64300, 101594, 128600, 203188, 253985, 257200, 406376, 507970, 812752, 1015940, 1269925, 2031880, 2539850, 4063760, 5079700, 10159400, 20318800]

約数ペア:

[(1, 20318800), (2, 10159400), (4, 5079700), (5, 4063760), (8, 2539850), (10, 2031880), (16, 1269925), (20, 1015940), (25, 812752), (40, 507970), (50, 406376), (79, 257200), (80, 253985), (100, 203188), (158, 128600), (200, 101594), (316, 64300), (395, 51440), (400, 50797), (632, 32150), (643, 31600), (790, 25720), (1264, 16075), (1286, 15800), (1580, 12860), (1975, 10288), (2572, 7900), (3160, 6430), (3215, 6320), (3950, 5144)]