19981250

素因数分解:

$2^1\times 5^5\times {\mathrm{23}}^1\times {\mathrm{139}}^1$

素因数の和:189

約数の個数: 48

約数和(自身を含む): 39372480

約数和(自身を除く): 19391230

約数列:

[1, 2, 5, 10, 23, 25, 46, 50, 115, 125, 139, 230, 250, 278, 575, 625, 695, 1150, 1250, 1390, 2875, 3125, 3197, 3475, 5750, 6250, 6394, 6950, 14375, 15985, 17375, 28750, 31970, 34750, 71875, 79925, 86875, 143750, 159850, 173750, 399625, 434375, 799250, 868750, 1998125, 3996250, 9990625, 19981250]

約数ペア:

[(1, 19981250), (2, 9990625), (5, 3996250), (10, 1998125), (23, 868750), (25, 799250), (46, 434375), (50, 399625), (115, 173750), (125, 159850), (139, 143750), (230, 86875), (250, 79925), (278, 71875), (575, 34750), (625, 31970), (695, 28750), (1150, 17375), (1250, 15985), (1390, 14375), (2875, 6950), (3125, 6394), (3197, 6250), (3475, 5750)]