21378561

素因数分解:

$3^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{67}}^1\times {\mathrm{73}}^1$

素因数の和:221

約数の個数: 32

約数和(自身を含む): 30916608

約数和(自身を除く): 9538047

約数列:

[1, 3, 31, 47, 67, 73, 93, 141, 201, 219, 1457, 2077, 2263, 3149, 3431, 4371, 4891, 6231, 6789, 9447, 10293, 14673, 97619, 106361, 151621, 229877, 292857, 319083, 454863, 689631, 7126187, 21378561]

約数ペア:

[(1, 21378561), (3, 7126187), (31, 689631), (47, 454863), (67, 319083), (73, 292857), (93, 229877), (141, 151621), (201, 106361), (219, 97619), (1457, 14673), (2077, 10293), (2263, 9447), (3149, 6789), (3431, 6231), (4371, 4891)]