19973380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{229}}^1$

素因数の和:341

約数の個数: 72

約数和(自身を含む): 49555800

約数和(自身を除く): 29582420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 89, 98, 140, 178, 196, 229, 245, 356, 445, 458, 490, 623, 890, 916, 980, 1145, 1246, 1603, 1780, 2290, 2492, 3115, 3206, 4361, 4580, 6230, 6412, 8015, 8722, 11221, 12460, 16030, 17444, 20381, 21805, 22442, 32060, 40762, 43610, 44884, 56105, 81524, 87220, 101905, 112210, 142667, 203810, 224420, 285334, 407620, 570668, 713335, 998669, 1426670, 1997338, 2853340, 3994676, 4993345, 9986690, 19973380]

約数ペア:

[(1, 19973380), (2, 9986690), (4, 4993345), (5, 3994676), (7, 2853340), (10, 1997338), (14, 1426670), (20, 998669), (28, 713335), (35, 570668), (49, 407620), (70, 285334), (89, 224420), (98, 203810), (140, 142667), (178, 112210), (196, 101905), (229, 87220), (245, 81524), (356, 56105), (445, 44884), (458, 43610), (490, 40762), (623, 32060), (890, 22442), (916, 21805), (980, 20381), (1145, 17444), (1246, 16030), (1603, 12460), (1780, 11221), (2290, 8722), (2492, 8015), (3115, 6412), (3206, 6230), (4361, 4580)]