21990375

素因数分解:

$3^2\times 5^3\times {\mathrm{11}}^1\times {\mathrm{1777}}^1$

素因数の和:1809

約数の個数: 48

約数和(自身を含む): 43269408

約数和(自身を除く): 21279033

約数列:

[1, 3, 5, 9, 11, 15, 25, 33, 45, 55, 75, 99, 125, 165, 225, 275, 375, 495, 825, 1125, 1375, 1777, 2475, 4125, 5331, 8885, 12375, 15993, 19547, 26655, 44425, 58641, 79965, 97735, 133275, 175923, 222125, 293205, 399825, 488675, 666375, 879615, 1466025, 1999125, 2443375, 4398075, 7330125, 21990375]

約数ペア:

[(1, 21990375), (3, 7330125), (5, 4398075), (9, 2443375), (11, 1999125), (15, 1466025), (25, 879615), (33, 666375), (45, 488675), (55, 399825), (75, 293205), (99, 222125), (125, 175923), (165, 133275), (225, 97735), (275, 79965), (375, 58641), (495, 44425), (825, 26655), (1125, 19547), (1375, 15993), (1777, 12375), (2475, 8885), (4125, 5331)]