21840440

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8951}}^1$

素因数の和:9023

約数の個数: 32

約数和(自身を含む): 49952160

約数和(自身を除く): 28111720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8951, 17902, 35804, 44755, 71608, 89510, 179020, 358040, 546011, 1092022, 2184044, 2730055, 4368088, 5460110, 10920220, 21840440]

約数ペア:

[(1, 21840440), (2, 10920220), (4, 5460110), (5, 4368088), (8, 2730055), (10, 2184044), (20, 1092022), (40, 546011), (61, 358040), (122, 179020), (244, 89510), (305, 71608), (488, 44755), (610, 35804), (1220, 17902), (2440, 8951)]