21237728

素因数分解:

$2^5\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{271}}^1$

素因数の和:391

約数の個数: 48

約数和(自身を含む): 43868160

約数和(自身を除く): 22630432

約数列:

[1, 2, 4, 8, 16, 31, 32, 62, 79, 124, 158, 248, 271, 316, 496, 542, 632, 992, 1084, 1264, 2168, 2449, 2528, 4336, 4898, 8401, 8672, 9796, 16802, 19592, 21409, 33604, 39184, 42818, 67208, 78368, 85636, 134416, 171272, 268832, 342544, 663679, 685088, 1327358, 2654716, 5309432, 10618864, 21237728]

約数ペア:

[(1, 21237728), (2, 10618864), (4, 5309432), (8, 2654716), (16, 1327358), (31, 685088), (32, 663679), (62, 342544), (79, 268832), (124, 171272), (158, 134416), (248, 85636), (271, 78368), (316, 67208), (496, 42818), (542, 39184), (632, 33604), (992, 21409), (1084, 19592), (1264, 16802), (2168, 9796), (2449, 8672), (2528, 8401), (4336, 4898)]