21100725

素因数分解:

$3^2\times 5^2\times {\mathrm{191}}^1\times {\mathrm{491}}^1$

素因数の和:698

約数の個数: 36

約数和(自身を含む): 38068992

約数和(自身を除く): 16968267

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 191, 225, 491, 573, 955, 1473, 1719, 2455, 2865, 4419, 4775, 7365, 8595, 12275, 14325, 22095, 36825, 42975, 93781, 110475, 281343, 468905, 844029, 1406715, 2344525, 4220145, 7033575, 21100725]

約数ペア:

[(1, 21100725), (3, 7033575), (5, 4220145), (9, 2344525), (15, 1406715), (25, 844029), (45, 468905), (75, 281343), (191, 110475), (225, 93781), (491, 42975), (573, 36825), (955, 22095), (1473, 14325), (1719, 12275), (2455, 8595), (2865, 7365), (4419, 4775)]