21004785

素因数分解:

$3^3\times 5^1\times {\mathrm{19}}^2\times {\mathrm{431}}^1$

素因数の和:483

約数の個数: 48

約数和(自身を含む): 39502080

約数和(自身を除く): 18497295

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 95, 135, 171, 285, 361, 431, 513, 855, 1083, 1293, 1805, 2155, 2565, 3249, 3879, 5415, 6465, 8189, 9747, 11637, 16245, 19395, 24567, 40945, 48735, 58185, 73701, 122835, 155591, 221103, 368505, 466773, 777955, 1105515, 1400319, 2333865, 4200957, 7001595, 21004785]

約数ペア:

[(1, 21004785), (3, 7001595), (5, 4200957), (9, 2333865), (15, 1400319), (19, 1105515), (27, 777955), (45, 466773), (57, 368505), (95, 221103), (135, 155591), (171, 122835), (285, 73701), (361, 58185), (431, 48735), (513, 40945), (855, 24567), (1083, 19395), (1293, 16245), (1805, 11637), (2155, 9747), (2565, 8189), (3249, 6465), (3879, 5415)]