21391250

素因数分解:

$2^1\times 5^4\times {\mathrm{109}}^1\times {\mathrm{157}}^1$

素因数の和:288

約数の個数: 40

約数和(自身を含む): 40721340

約数和(自身を除く): 19330090

約数列:

[1, 2, 5, 10, 25, 50, 109, 125, 157, 218, 250, 314, 545, 625, 785, 1090, 1250, 1570, 2725, 3925, 5450, 7850, 13625, 17113, 19625, 27250, 34226, 39250, 68125, 85565, 98125, 136250, 171130, 196250, 427825, 855650, 2139125, 4278250, 10695625, 21391250]

約数ペア:

[(1, 21391250), (2, 10695625), (5, 4278250), (10, 2139125), (25, 855650), (50, 427825), (109, 196250), (125, 171130), (157, 136250), (218, 98125), (250, 85565), (314, 68125), (545, 39250), (625, 34226), (785, 27250), (1090, 19625), (1250, 17113), (1570, 13625), (2725, 7850), (3925, 5450)]