320049920

素因数分解:

$2^8\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4099}}^1$

素因数の和:4181

約数の個数: 72

約数和(自身を含む): 779377200

約数和(自身を除く): 459327280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 160, 244, 256, 305, 320, 488, 610, 640, 976, 1220, 1280, 1952, 2440, 3904, 4099, 4880, 7808, 8198, 9760, 15616, 16396, 19520, 20495, 32792, 39040, 40990, 65584, 78080, 81980, 131168, 163960, 250039, 262336, 327920, 500078, 524672, 655840, 1000156, 1049344, 1250195, 1311680, 2000312, 2500390, 2623360, 4000624, 5000780, 5246720, 8001248, 10001560, 16002496, 20003120, 32004992, 40006240, 64009984, 80012480, 160024960, 320049920]

約数ペア:

[(1, 320049920), (2, 160024960), (4, 80012480), (5, 64009984), (8, 40006240), (10, 32004992), (16, 20003120), (20, 16002496), (32, 10001560), (40, 8001248), (61, 5246720), (64, 5000780), (80, 4000624), (122, 2623360), (128, 2500390), (160, 2000312), (244, 1311680), (256, 1250195), (305, 1049344), (320, 1000156), (488, 655840), (610, 524672), (640, 500078), (976, 327920), (1220, 262336), (1280, 250039), (1952, 163960), (2440, 131168), (3904, 81980), (4099, 78080), (4880, 65584), (7808, 40990), (8198, 39040), (9760, 32792), (15616, 20495), (16396, 19520)]