21402460

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1\times {\mathrm{331}}^1$

素因数の和:454

約数の個数: 48

約数和(自身を含む): 46684512

約数和(自身を除く): 25282052

約数列:

[1, 2, 4, 5, 10, 20, 53, 61, 106, 122, 212, 244, 265, 305, 331, 530, 610, 662, 1060, 1220, 1324, 1655, 3233, 3310, 6466, 6620, 12932, 16165, 17543, 20191, 32330, 35086, 40382, 64660, 70172, 80764, 87715, 100955, 175430, 201910, 350860, 403820, 1070123, 2140246, 4280492, 5350615, 10701230, 21402460]

約数ペア:

[(1, 21402460), (2, 10701230), (4, 5350615), (5, 4280492), (10, 2140246), (20, 1070123), (53, 403820), (61, 350860), (106, 201910), (122, 175430), (212, 100955), (244, 87715), (265, 80764), (305, 70172), (331, 64660), (530, 40382), (610, 35086), (662, 32330), (1060, 20191), (1220, 17543), (1324, 16165), (1655, 12932), (3233, 6620), (3310, 6466)]