21398913

素因数分解:

$3^2\times {\mathrm{37}}^1\times {\mathrm{179}}^1\times {\mathrm{359}}^1$

素因数の和:581

約数の個数: 24

約数和(自身を含む): 32011200

約数和(自身を除く): 10612287

約数列:

[1, 3, 9, 37, 111, 179, 333, 359, 537, 1077, 1611, 3231, 6623, 13283, 19869, 39849, 59607, 64261, 119547, 192783, 578349, 2377657, 7132971, 21398913]

約数ペア:

[(1, 21398913), (3, 7132971), (9, 2377657), (37, 578349), (111, 192783), (179, 119547), (333, 64261), (359, 59607), (537, 39849), (1077, 19869), (1611, 13283), (3231, 6623)]