21091425

素因数分解:

$3^1\times 5^2\times {\mathrm{19}}^3\times {\mathrm{41}}^1$

素因数の和:111

約数の個数: 48

約数和(自身を含む): 37705920

約数和(自身を除く): 16614495

約数列:

[1, 3, 5, 15, 19, 25, 41, 57, 75, 95, 123, 205, 285, 361, 475, 615, 779, 1025, 1083, 1425, 1805, 2337, 3075, 3895, 5415, 6859, 9025, 11685, 14801, 19475, 20577, 27075, 34295, 44403, 58425, 74005, 102885, 171475, 222015, 281219, 370025, 514425, 843657, 1110075, 1406095, 4218285, 7030475, 21091425]

約数ペア:

[(1, 21091425), (3, 7030475), (5, 4218285), (15, 1406095), (19, 1110075), (25, 843657), (41, 514425), (57, 370025), (75, 281219), (95, 222015), (123, 171475), (205, 102885), (285, 74005), (361, 58425), (475, 44403), (615, 34295), (779, 27075), (1025, 20577), (1083, 19475), (1425, 14801), (1805, 11685), (2337, 9025), (3075, 6859), (3895, 5415)]