21500409

素因数分解:

$3^1\times 7^1\times {\mathrm{251}}^1\times {\mathrm{4079}}^1$

素因数の和:4340

約数の個数: 16

約数和(自身を含む): 32901120

約数和(自身を除く): 11400711

約数列:

[1, 3, 7, 21, 251, 753, 1757, 4079, 5271, 12237, 28553, 85659, 1023829, 3071487, 7166803, 21500409]

約数ペア:

[(1, 21500409), (3, 7166803), (7, 3071487), (21, 1023829), (251, 85659), (753, 28553), (1757, 12237), (4079, 5271)]