21638480

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1373}}^1$

素因数の和:1583

約数の個数: 40

約数和(自身を含む): 50601672

約数和(自身を除く): 28963192

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1373, 1576, 1970, 2746, 3152, 3940, 5492, 6865, 7880, 10984, 13730, 15760, 21968, 27460, 54920, 109840, 270481, 540962, 1081924, 1352405, 2163848, 2704810, 4327696, 5409620, 10819240, 21638480]

約数ペア:

[(1, 21638480), (2, 10819240), (4, 5409620), (5, 4327696), (8, 2704810), (10, 2163848), (16, 1352405), (20, 1081924), (40, 540962), (80, 270481), (197, 109840), (394, 54920), (788, 27460), (985, 21968), (1373, 15760), (1576, 13730), (1970, 10984), (2746, 7880), (3152, 6865), (3940, 5492)]