21430520

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8783}}^1$

素因数の和:8855

約数の個数: 32

約数和(自身を含む): 49014720

約数和(自身を除く): 27584200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8783, 17566, 35132, 43915, 70264, 87830, 175660, 351320, 535763, 1071526, 2143052, 2678815, 4286104, 5357630, 10715260, 21430520]

約数ペア:

[(1, 21430520), (2, 10715260), (4, 5357630), (5, 4286104), (8, 2678815), (10, 2143052), (20, 1071526), (40, 535763), (61, 351320), (122, 175660), (244, 87830), (305, 70264), (488, 43915), (610, 35132), (1220, 17566), (2440, 8783)]