21298880

素因数分解:

$2^6\times 5^1\times {\mathrm{101}}^1\times {\mathrm{659}}^1$

素因数の和:777

約数の個数: 56

約数和(自身を含む): 51297840

約数和(自身を除く): 29998960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 101, 160, 202, 320, 404, 505, 659, 808, 1010, 1318, 1616, 2020, 2636, 3232, 3295, 4040, 5272, 6464, 6590, 8080, 10544, 13180, 16160, 21088, 26360, 32320, 42176, 52720, 66559, 105440, 133118, 210880, 266236, 332795, 532472, 665590, 1064944, 1331180, 2129888, 2662360, 4259776, 5324720, 10649440, 21298880]

約数ペア:

[(1, 21298880), (2, 10649440), (4, 5324720), (5, 4259776), (8, 2662360), (10, 2129888), (16, 1331180), (20, 1064944), (32, 665590), (40, 532472), (64, 332795), (80, 266236), (101, 210880), (160, 133118), (202, 105440), (320, 66559), (404, 52720), (505, 42176), (659, 32320), (808, 26360), (1010, 21088), (1318, 16160), (1616, 13180), (2020, 10544), (2636, 8080), (3232, 6590), (3295, 6464), (4040, 5272)]