19800320

素因数分解:

$2^8\times 5^1\times {\mathrm{31}}^1\times {\mathrm{499}}^1$

素因数の和:551

約数の個数: 72

約数和(自身を含む): 49056000

約数和(自身を除く): 29255680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 310, 320, 496, 499, 620, 640, 992, 998, 1240, 1280, 1984, 1996, 2480, 2495, 3968, 3992, 4960, 4990, 7936, 7984, 9920, 9980, 15469, 15968, 19840, 19960, 30938, 31936, 39680, 39920, 61876, 63872, 77345, 79840, 123752, 127744, 154690, 159680, 247504, 309380, 319360, 495008, 618760, 638720, 990016, 1237520, 1980032, 2475040, 3960064, 4950080, 9900160, 19800320]

約数ペア:

[(1, 19800320), (2, 9900160), (4, 4950080), (5, 3960064), (8, 2475040), (10, 1980032), (16, 1237520), (20, 990016), (31, 638720), (32, 618760), (40, 495008), (62, 319360), (64, 309380), (80, 247504), (124, 159680), (128, 154690), (155, 127744), (160, 123752), (248, 79840), (256, 77345), (310, 63872), (320, 61876), (496, 39920), (499, 39680), (620, 31936), (640, 30938), (992, 19960), (998, 19840), (1240, 15968), (1280, 15469), (1984, 9980), (1996, 9920), (2480, 7984), (2495, 7936), (3968, 4990), (3992, 4960)]