20797420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{997}}^1$

素因数の和:1162

約数の個数: 48

約数和(自身を含む): 50299200

約数和(自身を除く): 29501780

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 149, 298, 596, 745, 997, 1043, 1490, 1994, 2086, 2980, 3988, 4172, 4985, 5215, 6979, 9970, 10430, 13958, 19940, 20860, 27916, 34895, 69790, 139580, 148553, 297106, 594212, 742765, 1039871, 1485530, 2079742, 2971060, 4159484, 5199355, 10398710, 20797420]

約数ペア:

[(1, 20797420), (2, 10398710), (4, 5199355), (5, 4159484), (7, 2971060), (10, 2079742), (14, 1485530), (20, 1039871), (28, 742765), (35, 594212), (70, 297106), (140, 148553), (149, 139580), (298, 69790), (596, 34895), (745, 27916), (997, 20860), (1043, 19940), (1490, 13958), (1994, 10430), (2086, 9970), (2980, 6979), (3988, 5215), (4172, 4985)]