21341840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20521}}^1$

素因数の和:20547

約数の個数: 40

約数和(自身を含む): 53439288

約数和(自身を除く): 32097448

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20521, 41042, 82084, 102605, 164168, 205210, 266773, 328336, 410420, 533546, 820840, 1067092, 1333865, 1641680, 2134184, 2667730, 4268368, 5335460, 10670920, 21341840]

約数ペア:

[(1, 21341840), (2, 10670920), (4, 5335460), (5, 4268368), (8, 2667730), (10, 2134184), (13, 1641680), (16, 1333865), (20, 1067092), (26, 820840), (40, 533546), (52, 410420), (65, 328336), (80, 266773), (104, 205210), (130, 164168), (208, 102605), (260, 82084), (520, 41042), (1040, 20521)]