21357975

素因数分解:

$3^1\times 5^2\times {\mathrm{47}}^1\times {\mathrm{73}}^1\times {\mathrm{83}}^1$

素因数の和:216

約数の個数: 48

約数和(自身を含む): 36997632

約数和(自身を除く): 15639657

約数列:

[1, 3, 5, 15, 25, 47, 73, 75, 83, 141, 219, 235, 249, 365, 415, 705, 1095, 1175, 1245, 1825, 2075, 3431, 3525, 3901, 5475, 6059, 6225, 10293, 11703, 17155, 18177, 19505, 30295, 51465, 58515, 85775, 90885, 97525, 151475, 257325, 284773, 292575, 454425, 854319, 1423865, 4271595, 7119325, 21357975]

約数ペア:

[(1, 21357975), (3, 7119325), (5, 4271595), (15, 1423865), (25, 854319), (47, 454425), (73, 292575), (75, 284773), (83, 257325), (141, 151475), (219, 97525), (235, 90885), (249, 85775), (365, 58515), (415, 51465), (705, 30295), (1095, 19505), (1175, 18177), (1245, 17155), (1825, 11703), (2075, 10293), (3431, 6225), (3525, 6059), (3901, 5475)]