21303140

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{97}}^1\times {\mathrm{139}}^1$

素因数の和:324

約数の個数: 48

約数和(自身を含む): 46099200

約数和(自身を除く): 24796060

約数列:

[1, 2, 4, 5, 10, 20, 79, 97, 139, 158, 194, 278, 316, 388, 395, 485, 556, 695, 790, 970, 1390, 1580, 1940, 2780, 7663, 10981, 13483, 15326, 21962, 26966, 30652, 38315, 43924, 53932, 54905, 67415, 76630, 109810, 134830, 153260, 219620, 269660, 1065157, 2130314, 4260628, 5325785, 10651570, 21303140]

約数ペア:

[(1, 21303140), (2, 10651570), (4, 5325785), (5, 4260628), (10, 2130314), (20, 1065157), (79, 269660), (97, 219620), (139, 153260), (158, 134830), (194, 109810), (278, 76630), (316, 67415), (388, 54905), (395, 53932), (485, 43924), (556, 38315), (695, 30652), (790, 26966), (970, 21962), (1390, 15326), (1580, 13483), (1940, 10981), (2780, 7663)]