21187075

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{139}}^1$

素因数の和:236

約数の個数: 48

約数和(自身を含む): 33053440

約数和(自身を除く): 11866365

約数列:

[1, 5, 7, 13, 25, 35, 65, 67, 91, 139, 175, 325, 335, 455, 469, 695, 871, 973, 1675, 1807, 2275, 2345, 3475, 4355, 4865, 6097, 9035, 9313, 11725, 12649, 21775, 24325, 30485, 45175, 46565, 63245, 65191, 121069, 152425, 232825, 316225, 325955, 605345, 847483, 1629775, 3026725, 4237415, 21187075]

約数ペア:

[(1, 21187075), (5, 4237415), (7, 3026725), (13, 1629775), (25, 847483), (35, 605345), (65, 325955), (67, 316225), (91, 232825), (139, 152425), (175, 121069), (325, 65191), (335, 63245), (455, 46565), (469, 45175), (695, 30485), (871, 24325), (973, 21775), (1675, 12649), (1807, 11725), (2275, 9313), (2345, 9035), (3475, 6097), (4355, 4865)]