21691905

素因数分解:

$3^1\times 5^1\times {\mathrm{61}}^1\times {\mathrm{151}}^1\times {\mathrm{157}}^1$

素因数の和:377

約数の個数: 32

約数和(自身を含む): 35735808

約数和(自身を除く): 14043903

約数列:

[1, 3, 5, 15, 61, 151, 157, 183, 305, 453, 471, 755, 785, 915, 2265, 2355, 9211, 9577, 23707, 27633, 28731, 46055, 47885, 71121, 118535, 138165, 143655, 355605, 1446127, 4338381, 7230635, 21691905]

約数ペア:

[(1, 21691905), (3, 7230635), (5, 4338381), (15, 1446127), (61, 355605), (151, 143655), (157, 138165), (183, 118535), (305, 71121), (453, 47885), (471, 46055), (755, 28731), (785, 27633), (915, 23707), (2265, 9577), (2355, 9211)]