21180220

素因数分解:

$2^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1\times {\mathrm{163}}^1$

素因数の和:334

約数の個数: 48

約数和(自身を含む): 45874080

約数和(自身を除く): 24693860

約数列:

[1, 2, 4, 5, 10, 20, 73, 89, 146, 163, 178, 292, 326, 356, 365, 445, 652, 730, 815, 890, 1460, 1630, 1780, 3260, 6497, 11899, 12994, 14507, 23798, 25988, 29014, 32485, 47596, 58028, 59495, 64970, 72535, 118990, 129940, 145070, 237980, 290140, 1059011, 2118022, 4236044, 5295055, 10590110, 21180220]

約数ペア:

[(1, 21180220), (2, 10590110), (4, 5295055), (5, 4236044), (10, 2118022), (20, 1059011), (73, 290140), (89, 237980), (146, 145070), (163, 129940), (178, 118990), (292, 72535), (326, 64970), (356, 59495), (365, 58028), (445, 47596), (652, 32485), (730, 29014), (815, 25988), (890, 23798), (1460, 14507), (1630, 12994), (1780, 11899), (3260, 6497)]