21045825

素因数分解:

$3^4\times 5^2\times {\mathrm{19}}^1\times {\mathrm{547}}^1$

素因数の和:588

約数の個数: 60

約数和(自身を含む): 41110960

約数和(自身を除く): 20065135

約数列:

[1, 3, 5, 9, 15, 19, 25, 27, 45, 57, 75, 81, 95, 135, 171, 225, 285, 405, 475, 513, 547, 675, 855, 1425, 1539, 1641, 2025, 2565, 2735, 4275, 4923, 7695, 8205, 10393, 12825, 13675, 14769, 24615, 31179, 38475, 41025, 44307, 51965, 73845, 93537, 123075, 155895, 221535, 259825, 280611, 369225, 467685, 779475, 841833, 1107675, 1403055, 2338425, 4209165, 7015275, 21045825]

約数ペア:

[(1, 21045825), (3, 7015275), (5, 4209165), (9, 2338425), (15, 1403055), (19, 1107675), (25, 841833), (27, 779475), (45, 467685), (57, 369225), (75, 280611), (81, 259825), (95, 221535), (135, 155895), (171, 123075), (225, 93537), (285, 73845), (405, 51965), (475, 44307), (513, 41025), (547, 38475), (675, 31179), (855, 24615), (1425, 14769), (1539, 13675), (1641, 12825), (2025, 10393), (2565, 8205), (2735, 7695), (4275, 4923)]