21978680

素因数分解:

$2^3\times 5^1\times {\mathrm{59}}^1\times {\mathrm{67}}^1\times {\mathrm{139}}^1$

素因数の和:276

約数の個数: 64

約数和(自身を含む): 51408000

約数和(自身を除く): 29429320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 59, 67, 118, 134, 139, 236, 268, 278, 295, 335, 472, 536, 556, 590, 670, 695, 1112, 1180, 1340, 1390, 2360, 2680, 2780, 3953, 5560, 7906, 8201, 9313, 15812, 16402, 18626, 19765, 31624, 32804, 37252, 39530, 41005, 46565, 65608, 74504, 79060, 82010, 93130, 158120, 164020, 186260, 328040, 372520, 549467, 1098934, 2197868, 2747335, 4395736, 5494670, 10989340, 21978680]

約数ペア:

[(1, 21978680), (2, 10989340), (4, 5494670), (5, 4395736), (8, 2747335), (10, 2197868), (20, 1098934), (40, 549467), (59, 372520), (67, 328040), (118, 186260), (134, 164020), (139, 158120), (236, 93130), (268, 82010), (278, 79060), (295, 74504), (335, 65608), (472, 46565), (536, 41005), (556, 39530), (590, 37252), (670, 32804), (695, 31624), (1112, 19765), (1180, 18626), (1340, 16402), (1390, 15812), (2360, 9313), (2680, 8201), (2780, 7906), (3953, 5560)]