21979880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{983}}^1$

素因数の和:1050

約数の個数: 64

約数和(自身を含む): 54552960

約数和(自身を除く): 32573080

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 43, 52, 65, 86, 104, 130, 172, 215, 260, 344, 430, 520, 559, 860, 983, 1118, 1720, 1966, 2236, 2795, 3932, 4472, 4915, 5590, 7864, 9830, 11180, 12779, 19660, 22360, 25558, 39320, 42269, 51116, 63895, 84538, 102232, 127790, 169076, 211345, 255580, 338152, 422690, 511160, 549497, 845380, 1098994, 1690760, 2197988, 2747485, 4395976, 5494970, 10989940, 21979880]

約数ペア:

[(1, 21979880), (2, 10989940), (4, 5494970), (5, 4395976), (8, 2747485), (10, 2197988), (13, 1690760), (20, 1098994), (26, 845380), (40, 549497), (43, 511160), (52, 422690), (65, 338152), (86, 255580), (104, 211345), (130, 169076), (172, 127790), (215, 102232), (260, 84538), (344, 63895), (430, 51116), (520, 42269), (559, 39320), (860, 25558), (983, 22360), (1118, 19660), (1720, 12779), (1966, 11180), (2236, 9830), (2795, 7864), (3932, 5590), (4472, 4915)]