21988340

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{1123}}^1$

素因数の和:1232

約数の個数: 48

約数和(自身を含む): 50984640

約数和(自身を除く): 28996300

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 979, 1123, 1780, 1958, 2246, 3916, 4492, 4895, 5615, 9790, 11230, 12353, 19580, 22460, 24706, 49412, 61765, 99947, 123530, 199894, 247060, 399788, 499735, 999470, 1099417, 1998940, 2198834, 4397668, 5497085, 10994170, 21988340]

約数ペア:

[(1, 21988340), (2, 10994170), (4, 5497085), (5, 4397668), (10, 2198834), (11, 1998940), (20, 1099417), (22, 999470), (44, 499735), (55, 399788), (89, 247060), (110, 199894), (178, 123530), (220, 99947), (356, 61765), (445, 49412), (890, 24706), (979, 22460), (1123, 19580), (1780, 12353), (1958, 11230), (2246, 9790), (3916, 5615), (4492, 4895)]