21325112

素因数分解:

$2^3\times {\mathrm{61}}^1\times {\mathrm{89}}^1\times {\mathrm{491}}^1$

素因数の和:647

約数の個数: 32

約数和(自身を含む): 41180400

約数和(自身を除く): 19855288

約数列:

[1, 2, 4, 8, 61, 89, 122, 178, 244, 356, 488, 491, 712, 982, 1964, 3928, 5429, 10858, 21716, 29951, 43432, 43699, 59902, 87398, 119804, 174796, 239608, 349592, 2665639, 5331278, 10662556, 21325112]

約数ペア:

[(1, 21325112), (2, 10662556), (4, 5331278), (8, 2665639), (61, 349592), (89, 239608), (122, 174796), (178, 119804), (244, 87398), (356, 59902), (488, 43699), (491, 43432), (712, 29951), (982, 21716), (1964, 10858), (3928, 5429)]