21120640

素因数分解:

$2^7\times 5^1\times {\mathrm{61}}^1\times {\mathrm{541}}^1$

素因数の和:621

約数の個数: 64

約数和(自身を含む): 51414120

約数和(自身を除く): 30293480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 160, 244, 305, 320, 488, 541, 610, 640, 976, 1082, 1220, 1952, 2164, 2440, 2705, 3904, 4328, 4880, 5410, 7808, 8656, 9760, 10820, 17312, 19520, 21640, 33001, 34624, 39040, 43280, 66002, 69248, 86560, 132004, 165005, 173120, 264008, 330010, 346240, 528016, 660020, 1056032, 1320040, 2112064, 2640080, 4224128, 5280160, 10560320, 21120640]

約数ペア:

[(1, 21120640), (2, 10560320), (4, 5280160), (5, 4224128), (8, 2640080), (10, 2112064), (16, 1320040), (20, 1056032), (32, 660020), (40, 528016), (61, 346240), (64, 330010), (80, 264008), (122, 173120), (128, 165005), (160, 132004), (244, 86560), (305, 69248), (320, 66002), (488, 43280), (541, 39040), (610, 34624), (640, 33001), (976, 21640), (1082, 19520), (1220, 17312), (1952, 10820), (2164, 9760), (2440, 8656), (2705, 7808), (3904, 5410), (4328, 4880)]