21979503

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{571}}^1$

素因数の和:644

約数の個数: 48

約数和(自身を含む): 39975936

約数和(自身を除く): 17996433

約数列:

[1, 3, 7, 9, 13, 21, 39, 47, 63, 91, 117, 141, 273, 329, 423, 571, 611, 819, 987, 1713, 1833, 2961, 3997, 4277, 5139, 5499, 7423, 11991, 12831, 22269, 26837, 35973, 38493, 51961, 66807, 80511, 155883, 187859, 241533, 348881, 467649, 563577, 1046643, 1690731, 2442167, 3139929, 7326501, 21979503]

約数ペア:

[(1, 21979503), (3, 7326501), (7, 3139929), (9, 2442167), (13, 1690731), (21, 1046643), (39, 563577), (47, 467649), (63, 348881), (91, 241533), (117, 187859), (141, 155883), (273, 80511), (329, 66807), (423, 51961), (571, 38493), (611, 35973), (819, 26837), (987, 22269), (1713, 12831), (1833, 11991), (2961, 7423), (3997, 5499), (4277, 5139)]