21287980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{151}}^1$

素因数の和:239

約数の個数: 96

約数和(自身を含む): 55157760

約数和(自身を除く): 33869780

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 53, 70, 76, 95, 106, 133, 140, 151, 190, 212, 265, 266, 302, 371, 380, 530, 532, 604, 665, 742, 755, 1007, 1057, 1060, 1330, 1484, 1510, 1855, 2014, 2114, 2660, 2869, 3020, 3710, 4028, 4228, 5035, 5285, 5738, 7049, 7420, 8003, 10070, 10570, 11476, 14098, 14345, 16006, 20083, 20140, 21140, 28196, 28690, 32012, 35245, 40015, 40166, 56021, 57380, 70490, 80030, 80332, 100415, 112042, 140980, 152057, 160060, 200830, 224084, 280105, 304114, 401660, 560210, 608228, 760285, 1064399, 1120420, 1520570, 2128798, 3041140, 4257596, 5321995, 10643990, 21287980]

約数ペア:

[(1, 21287980), (2, 10643990), (4, 5321995), (5, 4257596), (7, 3041140), (10, 2128798), (14, 1520570), (19, 1120420), (20, 1064399), (28, 760285), (35, 608228), (38, 560210), (53, 401660), (70, 304114), (76, 280105), (95, 224084), (106, 200830), (133, 160060), (140, 152057), (151, 140980), (190, 112042), (212, 100415), (265, 80332), (266, 80030), (302, 70490), (371, 57380), (380, 56021), (530, 40166), (532, 40015), (604, 35245), (665, 32012), (742, 28690), (755, 28196), (1007, 21140), (1057, 20140), (1060, 20083), (1330, 16006), (1484, 14345), (1510, 14098), (1855, 11476), (2014, 10570), (2114, 10070), (2660, 8003), (2869, 7420), (3020, 7049), (3710, 5738), (4028, 5285), (4228, 5035)]