21264016

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{997}}^1$

素因数の和:1079

約数の個数: 40

約数和(自身を含む): 43560704

約数和(自身を除く): 22296688

約数列:

[1, 2, 4, 8, 16, 31, 43, 62, 86, 124, 172, 248, 344, 496, 688, 997, 1333, 1994, 2666, 3988, 5332, 7976, 10664, 15952, 21328, 30907, 42871, 61814, 85742, 123628, 171484, 247256, 342968, 494512, 685936, 1329001, 2658002, 5316004, 10632008, 21264016]

約数ペア:

[(1, 21264016), (2, 10632008), (4, 5316004), (8, 2658002), (16, 1329001), (31, 685936), (43, 494512), (62, 342968), (86, 247256), (124, 171484), (172, 123628), (248, 85742), (344, 61814), (496, 42871), (688, 30907), (997, 21328), (1333, 15952), (1994, 10664), (2666, 7976), (3988, 5332)]