20123980

素因数分解:

$2^2\times 5^1\times {\mathrm{163}}^1\times {\mathrm{6173}}^1$

素因数の和:6345

約数の個数: 24

約数和(自身を含む): 42526512

約数和(自身を除く): 22402532

約数列:

[1, 2, 4, 5, 10, 20, 163, 326, 652, 815, 1630, 3260, 6173, 12346, 24692, 30865, 61730, 123460, 1006199, 2012398, 4024796, 5030995, 10061990, 20123980]

約数ペア:

[(1, 20123980), (2, 10061990), (4, 5030995), (5, 4024796), (10, 2012398), (20, 1006199), (163, 123460), (326, 61730), (652, 30865), (815, 24692), (1630, 12346), (3260, 6173)]