20651841

素因数分解:

$3^7\times 7^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1$

素因数の和:118

約数の個数: 64

約数和(自身を含む): 37785600

約数和(自身を除く): 17133759

約数列:

[1, 3, 7, 9, 19, 21, 27, 57, 63, 71, 81, 133, 171, 189, 213, 243, 399, 497, 513, 567, 639, 729, 1197, 1349, 1491, 1539, 1701, 1917, 2187, 3591, 4047, 4473, 4617, 5103, 5751, 9443, 10773, 12141, 13419, 13851, 15309, 17253, 28329, 32319, 36423, 40257, 41553, 51759, 84987, 96957, 109269, 120771, 155277, 254961, 290871, 327807, 362313, 764883, 983421, 1086939, 2294649, 2950263, 6883947, 20651841]

約数ペア:

[(1, 20651841), (3, 6883947), (7, 2950263), (9, 2294649), (19, 1086939), (21, 983421), (27, 764883), (57, 362313), (63, 327807), (71, 290871), (81, 254961), (133, 155277), (171, 120771), (189, 109269), (213, 96957), (243, 84987), (399, 51759), (497, 41553), (513, 40257), (567, 36423), (639, 32319), (729, 28329), (1197, 17253), (1349, 15309), (1491, 13851), (1539, 13419), (1701, 12141), (1917, 10773), (2187, 9443), (3591, 5751), (4047, 5103), (4473, 4617)]