20952825

素因数分解:

$3^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 36336960

約数和(自身を除く): 15384135

約数列:

[1, 3, 5, 15, 25, 43, 73, 75, 89, 129, 215, 219, 267, 365, 445, 645, 1075, 1095, 1335, 1825, 2225, 3139, 3225, 3827, 5475, 6497, 6675, 9417, 11481, 15695, 19135, 19491, 32485, 47085, 57405, 78475, 95675, 97455, 162425, 235425, 279371, 287025, 487275, 838113, 1396855, 4190565, 6984275, 20952825]

約数ペア:

[(1, 20952825), (3, 6984275), (5, 4190565), (15, 1396855), (25, 838113), (43, 487275), (73, 287025), (75, 279371), (89, 235425), (129, 162425), (215, 97455), (219, 95675), (267, 78475), (365, 57405), (445, 47085), (645, 32485), (1075, 19491), (1095, 19135), (1335, 15695), (1825, 11481), (2225, 9417), (3139, 6675), (3225, 6497), (3827, 5475)]