20938640

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8443}}^1$

素因数の和:8487

約数の個数: 40

約数和(自身を含む): 50258688

約数和(自身を除く): 29320048

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8443, 16886, 33772, 42215, 67544, 84430, 135088, 168860, 261733, 337720, 523466, 675440, 1046932, 1308665, 2093864, 2617330, 4187728, 5234660, 10469320, 20938640]

約数ペア:

[(1, 20938640), (2, 10469320), (4, 5234660), (5, 4187728), (8, 2617330), (10, 2093864), (16, 1308665), (20, 1046932), (31, 675440), (40, 523466), (62, 337720), (80, 261733), (124, 168860), (155, 135088), (248, 84430), (310, 67544), (496, 42215), (620, 33772), (1240, 16886), (2480, 8443)]