21349725

素因数分解:

$3^1\times 5^2\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{131}}^1$

素因数の和:238

約数の個数: 48

約数和(自身を含む): 37122624

約数和(自身を除く): 15772899

約数列:

[1, 3, 5, 15, 25, 41, 53, 75, 123, 131, 159, 205, 265, 393, 615, 655, 795, 1025, 1325, 1965, 2173, 3075, 3275, 3975, 5371, 6519, 6943, 9825, 10865, 16113, 20829, 26855, 32595, 34715, 54325, 80565, 104145, 134275, 162975, 173575, 284663, 402825, 520725, 853989, 1423315, 4269945, 7116575, 21349725]

約数ペア:

[(1, 21349725), (3, 7116575), (5, 4269945), (15, 1423315), (25, 853989), (41, 520725), (53, 402825), (75, 284663), (123, 173575), (131, 162975), (159, 134275), (205, 104145), (265, 80565), (393, 54325), (615, 34715), (655, 32595), (795, 26855), (1025, 20829), (1325, 16113), (1965, 10865), (2173, 9825), (3075, 6943), (3275, 6519), (3975, 5371)]