18557721

素因数分解:

$3^3\times 7^2\times {\mathrm{13}}^2\times {\mathrm{83}}^1$

素因数の和:132

約数の個数: 72

約数和(自身を含む): 35048160

約数和(自身を除く): 16490439

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 49, 63, 83, 91, 117, 147, 169, 189, 249, 273, 351, 441, 507, 581, 637, 747, 819, 1079, 1183, 1323, 1521, 1743, 1911, 2241, 2457, 3237, 3549, 4067, 4563, 5229, 5733, 7553, 8281, 9711, 10647, 12201, 14027, 15687, 17199, 22659, 24843, 29133, 31941, 36603, 42081, 52871, 67977, 74529, 98189, 109809, 126243, 158613, 203931, 223587, 294567, 378729, 475839, 687323, 883701, 1427517, 2061969, 2651103, 6185907, 18557721]

約数ペア:

[(1, 18557721), (3, 6185907), (7, 2651103), (9, 2061969), (13, 1427517), (21, 883701), (27, 687323), (39, 475839), (49, 378729), (63, 294567), (83, 223587), (91, 203931), (117, 158613), (147, 126243), (169, 109809), (189, 98189), (249, 74529), (273, 67977), (351, 52871), (441, 42081), (507, 36603), (581, 31941), (637, 29133), (747, 24843), (819, 22659), (1079, 17199), (1183, 15687), (1323, 14027), (1521, 12201), (1743, 10647), (1911, 9711), (2241, 8281), (2457, 7553), (3237, 5733), (3549, 5229), (4067, 4563)]