21415880

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1\times {\mathrm{131}}^1$

素因数の和:270

約数の個数: 64

約数和(自身を含む): 50086080

約数和(自身を除く): 28670200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 67, 122, 131, 134, 244, 262, 268, 305, 335, 488, 524, 536, 610, 655, 670, 1048, 1220, 1310, 1340, 2440, 2620, 2680, 4087, 5240, 7991, 8174, 8777, 15982, 16348, 17554, 20435, 31964, 32696, 35108, 39955, 40870, 43885, 63928, 70216, 79910, 81740, 87770, 159820, 163480, 175540, 319640, 351080, 535397, 1070794, 2141588, 2676985, 4283176, 5353970, 10707940, 21415880]

約数ペア:

[(1, 21415880), (2, 10707940), (4, 5353970), (5, 4283176), (8, 2676985), (10, 2141588), (20, 1070794), (40, 535397), (61, 351080), (67, 319640), (122, 175540), (131, 163480), (134, 159820), (244, 87770), (262, 81740), (268, 79910), (305, 70216), (335, 63928), (488, 43885), (524, 40870), (536, 39955), (610, 35108), (655, 32696), (670, 31964), (1048, 20435), (1220, 17554), (1310, 16348), (1340, 15982), (2440, 8777), (2620, 8174), (2680, 7991), (4087, 5240)]