21400540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4931}}^1$

素因数の和:4978

約数の個数: 48

約数和(自身を含む): 53028864

約数和(自身を除く): 31628324

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4931, 9862, 19724, 24655, 34517, 49310, 69034, 98620, 138068, 152861, 172585, 305722, 345170, 611444, 690340, 764305, 1070027, 1528610, 2140054, 3057220, 4280108, 5350135, 10700270, 21400540]

約数ペア:

[(1, 21400540), (2, 10700270), (4, 5350135), (5, 4280108), (7, 3057220), (10, 2140054), (14, 1528610), (20, 1070027), (28, 764305), (31, 690340), (35, 611444), (62, 345170), (70, 305722), (124, 172585), (140, 152861), (155, 138068), (217, 98620), (310, 69034), (434, 49310), (620, 34517), (868, 24655), (1085, 19724), (2170, 9862), (4340, 4931)]