20863900

素因数分解:

$2^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:251

約数の個数: 72

約数和(自身を含む): 48608000

約数和(自身を除く): 27744100

約数列:

[1, 2, 4, 5, 10, 19, 20, 25, 38, 50, 76, 79, 95, 100, 139, 158, 190, 278, 316, 380, 395, 475, 556, 695, 790, 950, 1390, 1501, 1580, 1900, 1975, 2641, 2780, 3002, 3475, 3950, 5282, 6004, 6950, 7505, 7900, 10564, 10981, 13205, 13900, 15010, 21962, 26410, 30020, 37525, 43924, 52820, 54905, 66025, 75050, 109810, 132050, 150100, 208639, 219620, 264100, 274525, 417278, 549050, 834556, 1043195, 1098100, 2086390, 4172780, 5215975, 10431950, 20863900]

約数ペア:

[(1, 20863900), (2, 10431950), (4, 5215975), (5, 4172780), (10, 2086390), (19, 1098100), (20, 1043195), (25, 834556), (38, 549050), (50, 417278), (76, 274525), (79, 264100), (95, 219620), (100, 208639), (139, 150100), (158, 132050), (190, 109810), (278, 75050), (316, 66025), (380, 54905), (395, 52820), (475, 43924), (556, 37525), (695, 30020), (790, 26410), (950, 21962), (1390, 15010), (1501, 13900), (1580, 13205), (1900, 10981), (1975, 10564), (2641, 7900), (2780, 7505), (3002, 6950), (3475, 6004), (3950, 5282)]