21157190

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{139}}^1\times {\mathrm{491}}^1$

素因数の和:668

約数の個数: 32

約数和(自身を含む): 39674880

約数和(自身を除く): 18517690

約数列:

[1, 2, 5, 10, 31, 62, 139, 155, 278, 310, 491, 695, 982, 1390, 2455, 4309, 4910, 8618, 15221, 21545, 30442, 43090, 68249, 76105, 136498, 152210, 341245, 682490, 2115719, 4231438, 10578595, 21157190]

約数ペア:

[(1, 21157190), (2, 10578595), (5, 4231438), (10, 2115719), (31, 682490), (62, 341245), (139, 152210), (155, 136498), (278, 76105), (310, 68249), (491, 43090), (695, 30442), (982, 21545), (1390, 15221), (2455, 8618), (4309, 4910)]