21355280

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{109}}^1$

素因数の和:232

約数の個数: 80

約数和(自身を含む): 52377600

約数和(自身を除く): 31022320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 79, 80, 109, 124, 155, 158, 218, 248, 310, 316, 395, 436, 496, 545, 620, 632, 790, 872, 1090, 1240, 1264, 1580, 1744, 2180, 2449, 2480, 3160, 3379, 4360, 4898, 6320, 6758, 8611, 8720, 9796, 12245, 13516, 16895, 17222, 19592, 24490, 27032, 33790, 34444, 39184, 43055, 48980, 54064, 67580, 68888, 86110, 97960, 135160, 137776, 172220, 195920, 266941, 270320, 344440, 533882, 688880, 1067764, 1334705, 2135528, 2669410, 4271056, 5338820, 10677640, 21355280]

約数ペア:

[(1, 21355280), (2, 10677640), (4, 5338820), (5, 4271056), (8, 2669410), (10, 2135528), (16, 1334705), (20, 1067764), (31, 688880), (40, 533882), (62, 344440), (79, 270320), (80, 266941), (109, 195920), (124, 172220), (155, 137776), (158, 135160), (218, 97960), (248, 86110), (310, 68888), (316, 67580), (395, 54064), (436, 48980), (496, 43055), (545, 39184), (620, 34444), (632, 33790), (790, 27032), (872, 24490), (1090, 19592), (1240, 17222), (1264, 16895), (1580, 13516), (1744, 12245), (2180, 9796), (2449, 8720), (2480, 8611), (3160, 6758), (3379, 6320), (4360, 4898)]