21153040

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3347}}^1$

素因数の和:3439

約数の個数: 40

約数和(自身を含む): 49818240

約数和(自身を除く): 28665200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3347, 6320, 6694, 13388, 16735, 26776, 33470, 53552, 66940, 133880, 264413, 267760, 528826, 1057652, 1322065, 2115304, 2644130, 4230608, 5288260, 10576520, 21153040]

約数ペア:

[(1, 21153040), (2, 10576520), (4, 5288260), (5, 4230608), (8, 2644130), (10, 2115304), (16, 1322065), (20, 1057652), (40, 528826), (79, 267760), (80, 264413), (158, 133880), (316, 66940), (395, 53552), (632, 33470), (790, 26776), (1264, 16735), (1580, 13388), (3160, 6694), (3347, 6320)]