20381320

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8353}}^1$

素因数の和:8425

約数の個数: 32

約数和(自身を含む): 46615320

約数和(自身を除く): 26234000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8353, 16706, 33412, 41765, 66824, 83530, 167060, 334120, 509533, 1019066, 2038132, 2547665, 4076264, 5095330, 10190660, 20381320]

約数ペア:

[(1, 20381320), (2, 10190660), (4, 5095330), (5, 4076264), (8, 2547665), (10, 2038132), (20, 1019066), (40, 509533), (61, 334120), (122, 167060), (244, 83530), (305, 66824), (488, 41765), (610, 33412), (1220, 16706), (2440, 8353)]