19997718

素因数分解:

$2^1\times 3^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{157}}^1$

素因数の和:269

約数の個数: 64

約数和(自身を含む): 45868032

約数和(自身を除く): 25870314

約数列:

[1, 2, 3, 6, 13, 23, 26, 39, 46, 69, 71, 78, 138, 142, 157, 213, 299, 314, 426, 471, 598, 897, 923, 942, 1633, 1794, 1846, 2041, 2769, 3266, 3611, 4082, 4899, 5538, 6123, 7222, 9798, 10833, 11147, 12246, 21229, 21666, 22294, 33441, 42458, 46943, 63687, 66882, 93886, 127374, 140829, 144911, 256381, 281658, 289822, 434733, 512762, 769143, 869466, 1538286, 3332953, 6665906, 9998859, 19997718]

約数ペア:

[(1, 19997718), (2, 9998859), (3, 6665906), (6, 3332953), (13, 1538286), (23, 869466), (26, 769143), (39, 512762), (46, 434733), (69, 289822), (71, 281658), (78, 256381), (138, 144911), (142, 140829), (157, 127374), (213, 93886), (299, 66882), (314, 63687), (426, 46943), (471, 42458), (598, 33441), (897, 22294), (923, 21666), (942, 21229), (1633, 12246), (1794, 11147), (1846, 10833), (2041, 9798), (2769, 7222), (3266, 6123), (3611, 5538), (4082, 4899)]