15640400

素因数分解:

$2^4\times 5^2\times {\mathrm{61}}^1\times {\mathrm{641}}^1$

素因数の和:720

約数の個数: 60

約数和(自身を含む): 38251644

約数和(自身を除く): 22611244

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 61, 80, 100, 122, 200, 244, 305, 400, 488, 610, 641, 976, 1220, 1282, 1525, 2440, 2564, 3050, 3205, 4880, 5128, 6100, 6410, 10256, 12200, 12820, 16025, 24400, 25640, 32050, 39101, 51280, 64100, 78202, 128200, 156404, 195505, 256400, 312808, 391010, 625616, 782020, 977525, 1564040, 1955050, 3128080, 3910100, 7820200, 15640400]

約数ペア:

[(1, 15640400), (2, 7820200), (4, 3910100), (5, 3128080), (8, 1955050), (10, 1564040), (16, 977525), (20, 782020), (25, 625616), (40, 391010), (50, 312808), (61, 256400), (80, 195505), (100, 156404), (122, 128200), (200, 78202), (244, 64100), (305, 51280), (400, 39101), (488, 32050), (610, 25640), (641, 24400), (976, 16025), (1220, 12820), (1282, 12200), (1525, 10256), (2440, 6410), (2564, 6100), (3050, 5128), (3205, 4880)]