21090416

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{101}}^1\times {\mathrm{421}}^1$

素因数の和:561

約数の個数: 40

約数和(自身を含む): 42699648

約数和(自身を除く): 21609232

約数列:

[1, 2, 4, 8, 16, 31, 62, 101, 124, 202, 248, 404, 421, 496, 808, 842, 1616, 1684, 3131, 3368, 6262, 6736, 12524, 13051, 25048, 26102, 42521, 50096, 52204, 85042, 104408, 170084, 208816, 340168, 680336, 1318151, 2636302, 5272604, 10545208, 21090416]

約数ペア:

[(1, 21090416), (2, 10545208), (4, 5272604), (8, 2636302), (16, 1318151), (31, 680336), (62, 340168), (101, 208816), (124, 170084), (202, 104408), (248, 85042), (404, 52204), (421, 50096), (496, 42521), (808, 26102), (842, 25048), (1616, 13051), (1684, 12524), (3131, 6736), (3368, 6262)]