21420980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{8053}}^1$

素因数の和:8088

約数の個数: 48

約数和(自身を含む): 54122880

約数和(自身を除く): 32701900

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 70, 76, 95, 133, 140, 190, 266, 380, 532, 665, 1330, 2660, 8053, 16106, 32212, 40265, 56371, 80530, 112742, 153007, 161060, 225484, 281855, 306014, 563710, 612028, 765035, 1071049, 1127420, 1530070, 2142098, 3060140, 4284196, 5355245, 10710490, 21420980]

約数ペア:

[(1, 21420980), (2, 10710490), (4, 5355245), (5, 4284196), (7, 3060140), (10, 2142098), (14, 1530070), (19, 1127420), (20, 1071049), (28, 765035), (35, 612028), (38, 563710), (70, 306014), (76, 281855), (95, 225484), (133, 161060), (140, 153007), (190, 112742), (266, 80530), (380, 56371), (532, 40265), (665, 32212), (1330, 16106), (2660, 8053)]