21081760

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{2689}}^1$

素因数の和:2718

約数の個数: 72

約数和(自身を含む): 57958740

約数和(自身を除く): 36876980

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 56, 70, 80, 98, 112, 140, 160, 196, 224, 245, 280, 392, 490, 560, 784, 980, 1120, 1568, 1960, 2689, 3920, 5378, 7840, 10756, 13445, 18823, 21512, 26890, 37646, 43024, 53780, 75292, 86048, 94115, 107560, 131761, 150584, 188230, 215120, 263522, 301168, 376460, 430240, 527044, 602336, 658805, 752920, 1054088, 1317610, 1505840, 2108176, 2635220, 3011680, 4216352, 5270440, 10540880, 21081760]

約数ペア:

[(1, 21081760), (2, 10540880), (4, 5270440), (5, 4216352), (7, 3011680), (8, 2635220), (10, 2108176), (14, 1505840), (16, 1317610), (20, 1054088), (28, 752920), (32, 658805), (35, 602336), (40, 527044), (49, 430240), (56, 376460), (70, 301168), (80, 263522), (98, 215120), (112, 188230), (140, 150584), (160, 131761), (196, 107560), (224, 94115), (245, 86048), (280, 75292), (392, 53780), (490, 43024), (560, 37646), (784, 26890), (980, 21512), (1120, 18823), (1568, 13445), (1960, 10756), (2689, 7840), (3920, 5378)]