21337640

素因数分解:

$2^3\times 5^1\times {\mathrm{83}}^1\times {\mathrm{6427}}^1$

素因数の和:6521

約数の個数: 32

約数和(自身を含む): 48595680

約数和(自身を除く): 27258040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 83, 166, 332, 415, 664, 830, 1660, 3320, 6427, 12854, 25708, 32135, 51416, 64270, 128540, 257080, 533441, 1066882, 2133764, 2667205, 4267528, 5334410, 10668820, 21337640]

約数ペア:

[(1, 21337640), (2, 10668820), (4, 5334410), (5, 4267528), (8, 2667205), (10, 2133764), (20, 1066882), (40, 533441), (83, 257080), (166, 128540), (332, 64270), (415, 51416), (664, 32135), (830, 25708), (1660, 12854), (3320, 6427)]