21149960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{457}}^1$

素因数の和:570

約数の個数: 64

約数和(自身を含む): 51937200

約数和(自身を除く): 30787240

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 89, 104, 130, 178, 260, 356, 445, 457, 520, 712, 890, 914, 1157, 1780, 1828, 2285, 2314, 3560, 3656, 4570, 4628, 5785, 5941, 9140, 9256, 11570, 11882, 18280, 23140, 23764, 29705, 40673, 46280, 47528, 59410, 81346, 118820, 162692, 203365, 237640, 325384, 406730, 528749, 813460, 1057498, 1626920, 2114996, 2643745, 4229992, 5287490, 10574980, 21149960]

約数ペア:

[(1, 21149960), (2, 10574980), (4, 5287490), (5, 4229992), (8, 2643745), (10, 2114996), (13, 1626920), (20, 1057498), (26, 813460), (40, 528749), (52, 406730), (65, 325384), (89, 237640), (104, 203365), (130, 162692), (178, 118820), (260, 81346), (356, 59410), (445, 47528), (457, 46280), (520, 40673), (712, 29705), (890, 23764), (914, 23140), (1157, 18280), (1780, 11882), (1828, 11570), (2285, 9256), (2314, 9140), (3560, 5941), (3656, 5785), (4570, 4628)]