20784433900

素因数分解:

$2^2\times 5^2\times {\mathrm{79}}^1\times {\mathrm{787}}^1\times {\mathrm{3343}}^1$

素因数の和:4223

約数の個数: 72

約数和(自身を含む): 45744849920

約数和(自身を除く): 24960416020

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 79, 100, 158, 316, 395, 787, 790, 1574, 1580, 1975, 3148, 3343, 3935, 3950, 6686, 7870, 7900, 13372, 15740, 16715, 19675, 33430, 39350, 62173, 66860, 78700, 83575, 124346, 167150, 248692, 264097, 310865, 334300, 528194, 621730, 1056388, 1243460, 1320485, 1554325, 2630941, 2640970, 3108650, 5261882, 5281940, 6217300, 6602425, 10523764, 13154705, 13204850, 26309410, 26409700, 52618820, 65773525, 131547050, 207844339, 263094100, 415688678, 831377356, 1039221695, 2078443390, 4156886780, 5196108475, 10392216950, 20784433900]

約数ペア:

[(1, 20784433900), (2, 10392216950), (4, 5196108475), (5, 4156886780), (10, 2078443390), (20, 1039221695), (25, 831377356), (50, 415688678), (79, 263094100), (100, 207844339), (158, 131547050), (316, 65773525), (395, 52618820), (787, 26409700), (790, 26309410), (1574, 13204850), (1580, 13154705), (1975, 10523764), (3148, 6602425), (3343, 6217300), (3935, 5281940), (3950, 5261882), (6686, 3108650), (7870, 2640970), (7900, 2630941), (13372, 1554325), (15740, 1320485), (16715, 1243460), (19675, 1056388), (33430, 621730), (39350, 528194), (62173, 334300), (66860, 310865), (78700, 264097), (83575, 248692), (124346, 167150)]