21253015

素因数分解:

$5^1\times 7^2\times {\mathrm{223}}^1\times {\mathrm{389}}^1$

素因数の和:631

約数の個数: 24

約数和(自身を含む): 29877120

約数和(自身を除く): 8624105

約数列:

[1, 5, 7, 35, 49, 223, 245, 389, 1115, 1561, 1945, 2723, 7805, 10927, 13615, 19061, 54635, 86747, 95305, 433735, 607229, 3036145, 4250603, 21253015]

約数ペア:

[(1, 21253015), (5, 4250603), (7, 3036145), (35, 607229), (49, 433735), (223, 95305), (245, 86747), (389, 54635), (1115, 19061), (1561, 13615), (1945, 10927), (2723, 7805)]