21205504

素因数分解:

$2^9\times {\mathrm{83}}^1\times {\mathrm{499}}^1$

素因数の和:600

約数の個数: 40

約数和(自身を含む): 42966000

約数和(自身を除く): 21760496

約数列:

[1, 2, 4, 8, 16, 32, 64, 83, 128, 166, 256, 332, 499, 512, 664, 998, 1328, 1996, 2656, 3992, 5312, 7984, 10624, 15968, 21248, 31936, 41417, 42496, 63872, 82834, 127744, 165668, 255488, 331336, 662672, 1325344, 2650688, 5301376, 10602752, 21205504]

約数ペア:

[(1, 21205504), (2, 10602752), (4, 5301376), (8, 2650688), (16, 1325344), (32, 662672), (64, 331336), (83, 255488), (128, 165668), (166, 127744), (256, 82834), (332, 63872), (499, 42496), (512, 41417), (664, 31936), (998, 21248), (1328, 15968), (1996, 10624), (2656, 7984), (3992, 5312)]