21145072

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{277}}^1\times {\mathrm{367}}^1$

素因数の和:665

約数の個数: 40

約数和(自身を含む): 44399936

約数和(自身を除く): 23254864

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 277, 367, 554, 734, 1108, 1468, 2216, 2936, 3601, 4432, 4771, 5872, 7202, 9542, 14404, 19084, 28808, 38168, 57616, 76336, 101659, 203318, 406636, 813272, 1321567, 1626544, 2643134, 5286268, 10572536, 21145072]

約数ペア:

[(1, 21145072), (2, 10572536), (4, 5286268), (8, 2643134), (13, 1626544), (16, 1321567), (26, 813272), (52, 406636), (104, 203318), (208, 101659), (277, 76336), (367, 57616), (554, 38168), (734, 28808), (1108, 19084), (1468, 14404), (2216, 9542), (2936, 7202), (3601, 5872), (4432, 4771)]