21879320

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5639}}^1$

素因数の和:5747

約数の個数: 32

約数和(自身を含む): 49744800

約数和(自身を除く): 27865480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5639, 11278, 22556, 28195, 45112, 56390, 112780, 225560, 546983, 1093966, 2187932, 2734915, 4375864, 5469830, 10939660, 21879320]

約数ペア:

[(1, 21879320), (2, 10939660), (4, 5469830), (5, 4375864), (8, 2734915), (10, 2187932), (20, 1093966), (40, 546983), (97, 225560), (194, 112780), (388, 56390), (485, 45112), (776, 28195), (970, 22556), (1940, 11278), (3880, 5639)]