21477520

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{4007}}^1$

素因数の和:4087

約数の個数: 40

約数和(自身を含む): 50693184

約数和(自身を除く): 29215664

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 4007, 5360, 8014, 16028, 20035, 32056, 40070, 64112, 80140, 160280, 268469, 320560, 536938, 1073876, 1342345, 2147752, 2684690, 4295504, 5369380, 10738760, 21477520]

約数ペア:

[(1, 21477520), (2, 10738760), (4, 5369380), (5, 4295504), (8, 2684690), (10, 2147752), (16, 1342345), (20, 1073876), (40, 536938), (67, 320560), (80, 268469), (134, 160280), (268, 80140), (335, 64112), (536, 40070), (670, 32056), (1072, 20035), (1340, 16028), (2680, 8014), (4007, 5360)]