21320840

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{89}}^1\times {\mathrm{113}}^1$

素因数の和:266

約数の個数: 64

約数和(自身を含む): 49863600

約数和(自身を除く): 28542760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 89, 106, 113, 178, 212, 226, 265, 356, 424, 445, 452, 530, 565, 712, 890, 904, 1060, 1130, 1780, 2120, 2260, 3560, 4520, 4717, 5989, 9434, 10057, 11978, 18868, 20114, 23585, 23956, 29945, 37736, 40228, 47170, 47912, 50285, 59890, 80456, 94340, 100570, 119780, 188680, 201140, 239560, 402280, 533021, 1066042, 2132084, 2665105, 4264168, 5330210, 10660420, 21320840]

約数ペア:

[(1, 21320840), (2, 10660420), (4, 5330210), (5, 4264168), (8, 2665105), (10, 2132084), (20, 1066042), (40, 533021), (53, 402280), (89, 239560), (106, 201140), (113, 188680), (178, 119780), (212, 100570), (226, 94340), (265, 80456), (356, 59890), (424, 50285), (445, 47912), (452, 47170), (530, 40228), (565, 37736), (712, 29945), (890, 23956), (904, 23585), (1060, 20114), (1130, 18868), (1780, 11978), (2120, 10057), (2260, 9434), (3560, 5989), (4520, 4717)]