21892220

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{251}}^1$

素因数の和:363

約数の個数: 72

約数和(自身を含む): 54295920

約数和(自身を除く): 32403700

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 89, 98, 140, 178, 196, 245, 251, 356, 445, 490, 502, 623, 890, 980, 1004, 1246, 1255, 1757, 1780, 2492, 2510, 3115, 3514, 4361, 5020, 6230, 7028, 8722, 8785, 12299, 12460, 17444, 17570, 21805, 22339, 24598, 35140, 43610, 44678, 49196, 61495, 87220, 89356, 111695, 122990, 156373, 223390, 245980, 312746, 446780, 625492, 781865, 1094611, 1563730, 2189222, 3127460, 4378444, 5473055, 10946110, 21892220]

約数ペア:

[(1, 21892220), (2, 10946110), (4, 5473055), (5, 4378444), (7, 3127460), (10, 2189222), (14, 1563730), (20, 1094611), (28, 781865), (35, 625492), (49, 446780), (70, 312746), (89, 245980), (98, 223390), (140, 156373), (178, 122990), (196, 111695), (245, 89356), (251, 87220), (356, 61495), (445, 49196), (490, 44678), (502, 43610), (623, 35140), (890, 24598), (980, 22339), (1004, 21805), (1246, 17570), (1255, 17444), (1757, 12460), (1780, 12299), (2492, 8785), (2510, 8722), (3115, 7028), (3514, 6230), (4361, 5020)]