21939760

素因数分解:

$2^4\times 5^1\times {\mathrm{139}}^1\times {\mathrm{1973}}^1$

素因数の和:2125

約数の個数: 40

約数和(自身を含む): 51402960

約数和(自身を除く): 29463200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 139, 278, 556, 695, 1112, 1390, 1973, 2224, 2780, 3946, 5560, 7892, 9865, 11120, 15784, 19730, 31568, 39460, 78920, 157840, 274247, 548494, 1096988, 1371235, 2193976, 2742470, 4387952, 5484940, 10969880, 21939760]

約数ペア:

[(1, 21939760), (2, 10969880), (4, 5484940), (5, 4387952), (8, 2742470), (10, 2193976), (16, 1371235), (20, 1096988), (40, 548494), (80, 274247), (139, 157840), (278, 78920), (556, 39460), (695, 31568), (1112, 19730), (1390, 15784), (1973, 11120), (2224, 9865), (2780, 7892), (3946, 5560)]