21401385

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{89}}^1$

素因数の和:178

約数の個数: 64

約数和(自身を含む): 39191040

約数和(自身を除く): 17789655

約数列:

[1, 3, 5, 15, 17, 23, 41, 51, 69, 85, 89, 115, 123, 205, 255, 267, 345, 391, 445, 615, 697, 943, 1173, 1335, 1513, 1955, 2047, 2091, 2829, 3485, 3649, 4539, 4715, 5865, 6141, 7565, 10235, 10455, 10947, 14145, 16031, 18245, 22695, 30705, 34799, 48093, 54735, 62033, 80155, 83927, 104397, 173995, 186099, 240465, 251781, 310165, 419635, 521985, 930495, 1258905, 1426759, 4280277, 7133795, 21401385]

約数ペア:

[(1, 21401385), (3, 7133795), (5, 4280277), (15, 1426759), (17, 1258905), (23, 930495), (41, 521985), (51, 419635), (69, 310165), (85, 251781), (89, 240465), (115, 186099), (123, 173995), (205, 104397), (255, 83927), (267, 80155), (345, 62033), (391, 54735), (445, 48093), (615, 34799), (697, 30705), (943, 22695), (1173, 18245), (1335, 16031), (1513, 14145), (1955, 10947), (2047, 10455), (2091, 10235), (2829, 7565), (3485, 6141), (3649, 5865), (4539, 4715)]