21490768

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{277}}^1\times {\mathrm{373}}^1$

素因数の和:671

約数の個数: 40

約数和(自身を含む): 45123848

約数和(自身を除く): 23633080

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 277, 373, 554, 746, 1108, 1492, 2216, 2984, 3601, 4432, 4849, 5968, 7202, 9698, 14404, 19396, 28808, 38792, 57616, 77584, 103321, 206642, 413284, 826568, 1343173, 1653136, 2686346, 5372692, 10745384, 21490768]

約数ペア:

[(1, 21490768), (2, 10745384), (4, 5372692), (8, 2686346), (13, 1653136), (16, 1343173), (26, 826568), (52, 413284), (104, 206642), (208, 103321), (277, 77584), (373, 57616), (554, 38792), (746, 28808), (1108, 19396), (1492, 14404), (2216, 9698), (2984, 7202), (3601, 5968), (4432, 4849)]