21395980

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{193}}^1\times {\mathrm{241}}^1$

素因数の和:466

約数の個数: 48

約数和(自身を含む): 47323584

約数和(自身を除く): 25927604

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 92, 115, 193, 230, 241, 386, 460, 482, 772, 964, 965, 1205, 1930, 2410, 3860, 4439, 4820, 5543, 8878, 11086, 17756, 22172, 22195, 27715, 44390, 46513, 55430, 88780, 93026, 110860, 186052, 232565, 465130, 930260, 1069799, 2139598, 4279196, 5348995, 10697990, 21395980]

約数ペア:

[(1, 21395980), (2, 10697990), (4, 5348995), (5, 4279196), (10, 2139598), (20, 1069799), (23, 930260), (46, 465130), (92, 232565), (115, 186052), (193, 110860), (230, 93026), (241, 88780), (386, 55430), (460, 46513), (482, 44390), (772, 27715), (964, 22195), (965, 22172), (1205, 17756), (1930, 11086), (2410, 8878), (3860, 5543), (4439, 4820)]