21447860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{239}}^1\times {\mathrm{641}}^1$

素因数の和:896

約数の個数: 48

約数和(自身を含む): 51770880

約数和(自身を除く): 30323020

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 239, 478, 641, 956, 1195, 1282, 1673, 2390, 2564, 3205, 3346, 4487, 4780, 6410, 6692, 8365, 8974, 12820, 16730, 17948, 22435, 33460, 44870, 89740, 153199, 306398, 612796, 765995, 1072393, 1531990, 2144786, 3063980, 4289572, 5361965, 10723930, 21447860]

約数ペア:

[(1, 21447860), (2, 10723930), (4, 5361965), (5, 4289572), (7, 3063980), (10, 2144786), (14, 1531990), (20, 1072393), (28, 765995), (35, 612796), (70, 306398), (140, 153199), (239, 89740), (478, 44870), (641, 33460), (956, 22435), (1195, 17948), (1282, 16730), (1673, 12820), (2390, 8974), (2564, 8365), (3205, 6692), (3346, 6410), (4487, 4780)]