21391480

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{797}}^1$

素因数の和:880

約数の個数: 64

約数和(自身を含む): 53434080

約数和(自身を除く): 32042600

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 61, 88, 110, 122, 220, 244, 305, 440, 488, 610, 671, 797, 1220, 1342, 1594, 2440, 2684, 3188, 3355, 3985, 5368, 6376, 6710, 7970, 8767, 13420, 15940, 17534, 26840, 31880, 35068, 43835, 48617, 70136, 87670, 97234, 175340, 194468, 243085, 350680, 388936, 486170, 534787, 972340, 1069574, 1944680, 2139148, 2673935, 4278296, 5347870, 10695740, 21391480]

約数ペア:

[(1, 21391480), (2, 10695740), (4, 5347870), (5, 4278296), (8, 2673935), (10, 2139148), (11, 1944680), (20, 1069574), (22, 972340), (40, 534787), (44, 486170), (55, 388936), (61, 350680), (88, 243085), (110, 194468), (122, 175340), (220, 97234), (244, 87670), (305, 70136), (440, 48617), (488, 43835), (610, 35068), (671, 31880), (797, 26840), (1220, 17534), (1342, 15940), (1594, 13420), (2440, 8767), (2684, 7970), (3188, 6710), (3355, 6376), (3985, 5368)]