21322480

素因数分解:

$2^4\times 5^1\times {\mathrm{179}}^1\times {\mathrm{1489}}^1$

素因数の和:1681

約数の個数: 40

約数和(自身を含む): 49885200

約数和(自身を除く): 28562720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 179, 358, 716, 895, 1432, 1489, 1790, 2864, 2978, 3580, 5956, 7160, 7445, 11912, 14320, 14890, 23824, 29780, 59560, 119120, 266531, 533062, 1066124, 1332655, 2132248, 2665310, 4264496, 5330620, 10661240, 21322480]

約数ペア:

[(1, 21322480), (2, 10661240), (4, 5330620), (5, 4264496), (8, 2665310), (10, 2132248), (16, 1332655), (20, 1066124), (40, 533062), (80, 266531), (179, 119120), (358, 59560), (716, 29780), (895, 23824), (1432, 14890), (1489, 14320), (1790, 11912), (2864, 7445), (2978, 7160), (3580, 5956)]