21012975

素因数分解:

$3^2\times 5^2\times {\mathrm{61}}^1\times {\mathrm{1531}}^1$

素因数の和:1608

約数の個数: 36

約数和(自身を含む): 38278552

約数和(自身を除く): 17265577

約数列:

[1, 3, 5, 9, 15, 25, 45, 61, 75, 183, 225, 305, 549, 915, 1525, 1531, 2745, 4575, 4593, 7655, 13725, 13779, 22965, 38275, 68895, 93391, 114825, 280173, 344475, 466955, 840519, 1400865, 2334775, 4202595, 7004325, 21012975]

約数ペア:

[(1, 21012975), (3, 7004325), (5, 4202595), (9, 2334775), (15, 1400865), (25, 840519), (45, 466955), (61, 344475), (75, 280173), (183, 114825), (225, 93391), (305, 68895), (549, 38275), (915, 22965), (1525, 13779), (1531, 13725), (2745, 7655), (4575, 4593)]