20953940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{97}}^1\times {\mathrm{1543}}^1$

素因数の和:1656

約数の個数: 48

約数和(自身を含む): 50840832

約数和(自身を除く): 29886892

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 97, 140, 194, 388, 485, 679, 970, 1358, 1543, 1940, 2716, 3086, 3395, 6172, 6790, 7715, 10801, 13580, 15430, 21602, 30860, 43204, 54005, 108010, 149671, 216020, 299342, 598684, 748355, 1047697, 1496710, 2095394, 2993420, 4190788, 5238485, 10476970, 20953940]

約数ペア:

[(1, 20953940), (2, 10476970), (4, 5238485), (5, 4190788), (7, 2993420), (10, 2095394), (14, 1496710), (20, 1047697), (28, 748355), (35, 598684), (70, 299342), (97, 216020), (140, 149671), (194, 108010), (388, 54005), (485, 43204), (679, 30860), (970, 21602), (1358, 15430), (1543, 13580), (1940, 10801), (2716, 7715), (3086, 6790), (3395, 6172)]