21011745

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^2\times {\mathrm{37}}^1\times {\mathrm{131}}^1$

素因数の和:210

約数の個数: 48

約数和(自身を含む): 36957888

約数和(自身を除く): 15946143

約数列:

[1, 3, 5, 15, 17, 37, 51, 85, 111, 131, 185, 255, 289, 393, 555, 629, 655, 867, 1445, 1887, 1965, 2227, 3145, 4335, 4847, 6681, 9435, 10693, 11135, 14541, 24235, 32079, 33405, 37859, 53465, 72705, 82399, 113577, 160395, 189295, 247197, 411995, 567885, 1235985, 1400783, 4202349, 7003915, 21011745]

約数ペア:

[(1, 21011745), (3, 7003915), (5, 4202349), (15, 1400783), (17, 1235985), (37, 567885), (51, 411995), (85, 247197), (111, 189295), (131, 160395), (185, 113577), (255, 82399), (289, 72705), (393, 53465), (555, 37859), (629, 33405), (655, 32079), (867, 24235), (1445, 14541), (1887, 11135), (1965, 10693), (2227, 9435), (3145, 6681), (4335, 4847)]